Download or read book Superplasticity in Thermomechanically Processed High Magnesium Aluminum Magnesium Alloys written by J. J. Becker and published by . This book was released on 1984 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: The elevated temperature deformation characteristics of two thermomechanically processed high magnesium, aluminum-magnesium alloys were investigated. The thermomechanical processing itself included warm rolling at 300 deg C to 94% reduction. Subsequent treatments included annealing after rolling for either one-half hour or ten hours at 300 deg C, or one half hour at 440 deg C. These annealing treatments resulted in varying degrees of recrystallization and grain growth and facilitated examination of the effect of grain size on the superplastic deformation characteristics of these alloys. Tension testing was conducted at strain rates ranging from .000053 to .053 S-1 and temperatures varying from ambient to 300 deg C. Materials in the warm rolled condition exhibited the highest strength at ambient temperature and were generally most superplastic at elevated temperature. An Al 10%Mg-0.5%Mn alloy exhibited elongation of approximately 400% at 300 deg C.

Download or read book The Effect of Alloy Additions on Superplasticity in Thermomechanically Processed High Magnesium Aluminum Magnesium Alloys written by R. J. Self and published by . This book was released on 1984 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research extends previous thesis work by Becker and Mills, and is concurrent with that of Stengel on the superplastic behavior of warm rolled high-Mg, Al-Mg alloys. In this work, the effect of various alloy additions were investigated. The following Al-Mg alloy compositions were studied: 8% Mg; 8% Mg-0.4% Cu; 8% Mg-0.4% Cu-0.5% Mn; 10% Mg; 10% Mg-0.4% Cu; 10% Mg-0.2% Mn. These materials were solution treated and hot worked at 440 C and then warm rolled at 300 C to 94% reduction. Tensile testing was then conducted for the as-rolled condition. The alloys were tested at temperatures ranging from room temperature to 300 C and at strain rates from .000056/sec to .14/sec. The copper addition has, on the same weight percentage basis, the same effect on superplasticity as does the addition of manganese to the alloy. The addition of small amounts (i.e., approximately 0.2 weight percent) of manganese appears to offer little advantage over the binary compositions in terms of super plasticity.

Download or read book Analysis of Grain Refinement and Superplasticity in Aluminum Magnesium Alloys written by Ahmed Ahmed Abou-Salama and published by . This book was released on 1987 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous research had demonstrated superplastic behavior in aluminum-magnesium alloys of high magnesium content to result from deformation processing to an initially non recrystallized condition. Analysis here of those data has demonstrated that such a result may be understood in terms of constitutive equations developed for fine-grained materials and that the constitutive equations are applicable to materials achieving grain boundary misorientations in the range of only 2 to 7 by a process of continuous recrystallization. The constitutive equations provide a basis for analysis of anomalous temperature dependence of the strength and of the activation energy for plastic deformation seen as well in this work. A study of the separate effects of processing variables has lead to a model for continuous recrystallization during deformation processing. This model considers recovery of dislocations to sub-boundaries to be the critical step in this process. Application of this model to development of advanced aluminum alloys for air frame structural applications will result in increased weight savings by such processing methods. Theses Keywords: Superplasticity; Aluminum magnesium alloys; Thermomechanical processing; Microstructural evolution; Continuous recrystallization; Microstructural instability; Grain growth.

Download or read book Superplasticity in a Thermo Mechanically Processed Aluminum 10 2 Mg 0 52 Mn Alloy written by Max E. Mills and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research extended the previous work performed by Becker on the elevated temperature deformation characteristics of an aluminum-10.2% magnesium-0.52% manganese alloy. The alloy was warm rolled at 300 C to 94% reduction. Stress-strain testing was utilized to collect data for stress vs strain rate and ductility vs strain rate, as well as, stress exponents and activation energies. Tensile testing was performed at strain rates at .000139 per sec. and temperatures from 20 C to 425 C. Ductility ranged from 400% at 300 C and 600% at 325 C to 700% at 425 C. The data clearly establishes that the warm rolled alloy is superplastic at temperatures as low as 275 C and may exhibit superplastic elongations (greater than 400%) at strain rates at high as .01 per sec at 325 C. Scanning electron microscope observations indicated little or no void formation at or below 300 C. The high ductilities observed at temperatures above the solvus are the result of grain boundary sliding. Originator-supplied keywords included: Superplasticity, Aluminum, Aluminum alloys, Aluminum-magnesium, Thermo-mechanical processing, Rolling, Warm rolling, Annealing recrystallization, Grain Refinement, Precipitation, Cavitation, Grain boundary sliding, Computer programs, Fortran, Theses.

Download or read book Superplasiticity in Thermomechanically Processed High Magnesium Aluminum magnesium Alloys written by John J. Becker and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Strength Aluminum Magnesium Alloys Thermomechanical Processing Microstructure and Tensile Mechanical Properties written by Raymond Arthur Grandon and published by . This book was released on 1979 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microstructures and mechanical properties of thermomechanically processed Aluminum-Magnesium alloys were investigated in this research. Magnesium content of the alloys ranged from 7 to 12 weight percent and an alloy containing 10 percent Mg and 0.5 percent Cu was also examined. Thermomechanical processing treatments involved solution treatment followed by warm isothermal rolling. Temperature for this warm rolling was typically 300 C, and this is below the solvus temperature for the alloy. Such processing results in a fine dispersion of the intermetallic compound Al3Mg2 (beta) in a solid solution matrix. Typical mechanical properties are an ultimate tensile strength of 520 Mpa (75000 psi), with 12 percent elongation to fracture. Such a material may be further cold worked to ultimate tensile strengths of 620 Mpa (90000 psi), with 6 percent elongation to fracture. Dynamic recrystallization is necessary to achieve a uniform dispersion of the intermetallic in subsequent processing. (Author).

Download or read book The Age Hardening Response of Thermomechanically Processed Al Mg Li Alloys written by William F. Ferris and published by . This book was released on 1987 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four Al-Mg-Li alloys of composition (weight percent) in the ranges 6-8% Mg, 0.5-2% Li, and 0.15-0.25% Zr were hot forged and warm rolled (thermo-mechanically processed) to achieve a microstructure suitable for superplasticity. They were then subjected to age-hardening studies at temperatures indicated by concurrent differential scanning calorimetry research. Optical and transmission electron microscopy techniques were used to relate microstructure to mechanical properties. Only the 6%Mg-2%Li alloy showed significant age hardening response, however, concurrent research demonstrated excellent superplastic response in the 6%Mg-1%Li and 8%Mg-1%Li alloys. Keywords: Thermomechanically, Processed, Superplasticity, Age Hardening Studies, Aluminum alloys, Magnesium alloys, Lithium alloys.

Download or read book Mechanical Characteristics of a Superplastic Aluminum 10 2 Mg 0 1 Zr Alloy written by T. S. Hartmann and published by . This book was released on 1985 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The elevated temperature mechanical characteristics of an aluminum-magnesium-zirconium alloy were studied. Thermomechanical processing consisted of solution treating and hot working at 440 C and then warm rolling at 300 C to 94% reduction. Subsequent treatments included annealing at 200 C for one hour, and recrystallizing for one minute at 440 C. Tensile testing of warm rolled, annealed, and recrystallized material was conducted at various strain rates and temperatures. The data was analyzed to determine strain-rate sensitivity coefficients and activation energies, in turn to be correlated with microstructural data concurrently obtained on this superplastic alloy. This material exhibits particularly good ambient properties in addition to the superplasticity. Originator supplied keywords include: Aluminum; Aluminum-Magnesium alloys, Creep models.

Download or read book High Plasticity Magnesium Alloys written by Fusheng Pan and published by Elsevier. This book was released on 2022-01-21 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: High Plasticity Magnesium Alloys focuses on the microstructure, mechanical properties and processing methods of magnesium alloy materials. The title offers theory and methods on high-plasticity magnesium alloys, including phase diagram construction, alloying and deformation. Four typical high-plasticity magnesium alloys are discussed through thermodynamic phase diagram construction and the characterization of their microstructure, mechanical properties and texture at as-cast, extruded, rolled and heat-treated states. Chapters update principle calculations for the effects of alloying elements, Mg-Gd-Zr medium strength and high-plasticity alloys, medium strength and high-plasticity Mg-Mn based alloys, medium strength and high-plasticity Mc-Sn based alloys, and Mg-Gd-Y-Zn-Mn high-strength and high-plasticity magnesium alloys. This book presents the plasticity of magnesium alloys, and guides the design and development of new high-strength and high-plasticity magnesium alloys. It provides detailed solutions for practicing industrial engineers. - Presents in-depth theory and research methods on high-plasticity magnesium alloys - Considers the microstructure, mechanical properties and processing methods of high-performance magnesium alloys - Shows the first principles needed to calculate the effects of various alloying elements - Introduces the development of magnesium alloys with relatively high plasticity - Characterizes the plasticity of polycrystalline metallic materials - Provides detailed solutions for industrial engineers who need to use high-performance magnesium alloys

Download or read book High Strength Aluminum magnesium Alloys written by Raymond Arthur Grandon and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Superplasticity in Commercial and Experimental Compositions of Magnesium Alloy Sheet written by Milton M. Tilman and published by . This book was released on 1982 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Superplasticity in Selected Magnesium base Alloys written by Milton M. Tilman and published by . This book was released on 1979 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Preliminary Investigation of the Corrosion and Stress Corrosion Susceptibility of Thermomechanically Processed High Magnesium Aluminum Magnesium Alloys written by and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The stress corrosion cracking susceptibility and general corrosion characteristics of four thermomechanically processed high-Magnesium, Aluminum-Magnesium alloys were evaluated and compared to those of 7076-T6. Results obtained from stress-corrosion testing and from tension testing after stress-corrosion exposure indicate that these 8-10% Mg alloys are less susceptible to stress-corrosion cracking than 7075-T6. The addition of Cu or Cu and Mn to a 10% Mg alloy raises strength, homogenizes the microstructure and reduces the tendency of such an alloy to exhibit intergranular cracking and exfoliation, especially in a sensitized condition. Results of accelerated general corrosion testing and marine exposure both indicate that binary 8% Mg and 10% Mg alloys are highly resistant to corrosion. Alloying with Cu or Cu and Mn accelerates weight loss but to a lesser degree than observed for 7075-T6. (Author).

Download or read book Processing Studies of Aluminum magnesium and Aluminum copper lithium Alloys written by Frank J. Harsacky and published by . This book was released on 1990 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: Investigation into the effect on superplastic behavior of two aluminum alloys produced by variations of thermomechanical processing parameters was conducted. The alloys in this study are Al-10Mg-0.1Zr (weight percent) and 2090, which is Al-2.56Cu-2.03Li-0.12Zr (weight percent). Determination of the existence of an optimum balance between deformation and recovery for the Al-10Mg-0.1Zr alloy was accomplished by extending the annealing interval to 60 minutes during warm rolling at 300 C. The optimum balance is a 30 minute annealing interval between rolling passes. Processing of Al-10Mg-0.1Zr with a rolling temperature lower than the annealing temperature produced ductilities which are less than those obtained by utilization of the optimum process. The extension of annealing intervals in the processing of 2090 resulted in increased superplastic response when compared with results obtained employing shorter annealing intervals. By application of a two-temperature process which incorporates rolling at a lower temperature than the annealing temperature, the determination has been made that enhanced ductility results however, the annealing interval of 14 minutes should be extended.

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, SIld disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna and broader dissemination. tional publishing house to assure improved service Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 30 (thesis year 1985) a total of 12,400 theses titles from 26 Canadian and 186 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work.

Download or read book Effects of Annealing Treatments on Superplasticity in a Thermomechanically Processed Aluminum 10 2 Mg 0 52 Mn written by A. F. Stengel and published by . This book was released on 1984 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research follows previous thesis work by Becker and Mills on superplastic behavior of a warm rolled Al-10.2%Mg-0.52%Mn alloy. Elongations of up to 391% were reported to them for tension testing at 300 C and a strain rate of .0014/s. In this work, material was warm rolled at 300 C to 94% reduction and then subjected to one of five subsequent annealing treatments: 1 hour at 200 C, 10 hours at 200 C, 1/2 hour at 250 C, 1 hour at 250 C, or 1/2 hour at 440 C (to recrystallize the material). Tension testing at temperatures ranging from 300 C to 425 C was then conducted. Annealing below the rolling temperature enhances superplastic behavior when compared to the as rolled condition. For example, material warm rolled at 300 C with a strain rate of .0056/s gave a ductility of 572%. Annealing, however, for 1/2 hour at 440 C results in a recrystallized structure which is stronger than the as-rolled condition and less ductile when tested at 300 C. Originator's supplied keywords include: aluminum, aluminum-magnesium, grain refinement, precipitation, cavitation, grain boundary sliding.

Download or read book An Investigation Into the Influence of Thermomechanical Processing on Microstructure and Mechanical Properties of High Strength Aluminum Magnesium Alloys written by William Goodwin Speed and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microstructures and mechanical properties resulting from thermomechanical processing of high-Magnesium (Mg) content Aluminum-Magnesium (Al-Mg) alloys were investigated in this research. Warm rolling processes, intended to refine both grain size and second phase Al3Mg2 (beta) particle size, were conducted for alloy compositions of 10.2 weight % Mg, 10.2 weight % Mg plus 0.5 weight % copper (Cu) and 12.1 weight % Mg. Solution treatment, hot upset forging, resolutioning and rapid cooling provided initial microstructural homogenization. Subsequent warm rolling was employed to refine the microstructure. The effect of warm rolling parameters of beta particle size and distribution was of particular concern. By warm rolling an alloy containing 10.2 % Mg plus 0.5 % Cu at 250 C, an ultimate tensile strength of 565 MPa (82000 psi), with 11.5 % elongation, was achieved with the added advantage of a strength to density ratio higher than present equivalent-strength alloys, such as 7075-T6.