Download or read book Effect of Reheating Process on Microstructure and Mechanical Property of A390 Aluminum Alloy written by and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Influence of Heat Treatment on the Microstructure and Mechanical Properties of 6061 Aluminum Alloy written by and published by . This book was released on 2013 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: The process of heat treatment is the method by which metals are heated and cooled in a series of specific operations that never allow the metal to reach the molten state. The purpose of the heat treatment is to cause desire changes in the metallurgical structure and thus in the properties of metal parts. The aim of this research is to study the influence of heat treatment and natural aging mechanism on the microstructure and mechanical properties of aluminum alloy 6061. The aluminum alloy 6061 sample heat treated using T4 method which is heat treated at 550°C, 575°C and 600°C and then naturally aged at ambient environment for 3 hours. After heat treated process, the effects were investigated in terms of microstructure using metallurgical analysis and mechanical properties by tensile tests and hardness test. Tensile tests show that the yield stress and UTS have high value when heat treated at 600°C where 103.28693 MPa and 195.246895 MPa meanwhile the Young modulus heat treated at 550°C have high value; 84417.95106 MPa. For heat treatment specimens, the high VHN is specimen's heat treated at 600°C which have value 85.7 and the lower VHN value is specimen's heat treated at 550°C with value 57.5. The heat treatment process result soft aluminum alloy 6061. Lastly for microstructure observation, different microstructure appear within different heat treatment temperature. From the data and result that already determined, it achieved the objectives and scope of this research.

Download or read book Effects of Composition and Primary Processing on the Microstructure and Mechanical Properties of High strength Aluminum Alloys written by T. H. Sanders and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Heat treatment Process on Microstructure and Mechanical Property of Al Co Cr Fe Ni Multiprincipal Component Alloys written by and published by . This book was released on 2021 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Post Welded Heat Treatments on Microstructure and Mechanical Properties of Friction Stir Welded Joints of 7A04 O Aluminum Alloy written by and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Processing and Microstructure on the Mechanical Properties of Aluminum Alloy 339 T5 written by Paul Noles Crepeau and published by . This book was released on 1989 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Processing and Microstructure on the Mechanical Properties of Aluminium Alloy 339 T5 written by Paul Noles Crepeau and published by . This book was released on 1989 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermomechanical Processing of Aluminum Alloys written by James G. Morris and published by . This book was released on 1979 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of the Processing Conditions on the Microstructural Features and Mechanical Behavior of Aluminum Alloys written by Tomasz Tański and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminum and aluminum alloys are widely used for aircraft structures, where they are subjected to demanding conditions and where is an increased demand for weight reduction and fuel savings. Aluminum comprises 8% of the earth?s crust and is, therefore, the most abundant structural metal. Its production since 1965 has surpassed that of copper and now comes next to iron. This increased use of aluminum alloys leads to a need for deeper understanding of their mechanical properties and the impacts of processing parameters. The mechanical properties can determine by controlling the microstructures of the alloys. For example, precipitation hardening is the main strengthening mechanism improving the tensile and yield strength. Solute atoms, precipitates and dispersoids influences to the yield strength, since they act as distributed pinning points for mobile dislocations, thus increasing the shear stress required to move the dislocations. Another approach is the manipulation of a grain size that can be performed by alloying or plastic deformation processes. Therefore, the precise understanding of each mechanism that can influence the properties of aluminum and its alloys is very important. The aim of this chapter is to shed light on the influence of the processing history on the microstructure and mechanical properties.

Download or read book Influence of Welding and Heat Treatment on Aluminum Alloys written by Eric B. Hilty and published by . This book was released on 2014 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: The welding of structural materials, such as aluminum alloys 6063, 6061 and 6005A, does have an adverse influence on the microstructure and mechanical properties at locations immediately adjacent to the weld. The influence of heat input, due to welding and artificial aging, was investigated on aluminum alloy extrusions of 6063, 6061 and 6005A. Uniaxial tensile tests, in conjunction with scanning electron microscopy observations, were done on the: (i) as-provided alloy in the natural temper, (ii) the as-provided alloy artificially aged, (iii) the as-welded alloy in the natural temper, and (iv) the as-welded alloy subject to heat treatment. The welding process used was gas metal arc (GMAW) with spray transfer at approximately 140-220 amps of current at 22-26 volts. The artificial aging used was a precipitation heat treatment for 6 hours at 360oF. The aluminum alloys of the 6XXX series contain magnesium (Mg) and silicone (Si) and are responsive to temperature. Optical microscopy observations revealed the influence of artificial aging to cause change in both size and shape of the second-phase particles present and distributed through the microstructure. The temperature and time of exposure to heat treatment did cause the second-phase particles to both precipitate and migrate through the microstructure resulting in an observable change in strength of the material. Uniaxial tensile tests were conducted for desired specimen thicknesses for sake of comparison. Section 6.4.2-2 of the 2010 Aluminum Design manual discusses provisions for mechanical properties of welded and artificially aged aluminum light poles, fabricated from aluminum alloy 6063 and 6005A. A basis for these provisions was the result of older round-robin testing programs [2, 3]. However, results of the studies were never placed in the open literature. Hence, the focus of this study was to determine the expected mechanical properties of welded and artificially aged 6063, 6061 and 6005A aluminum alloys and publish the results. Tensile tests revealed the welded aluminum alloy to have lower strength, both yield and ultimate tensile strength, when compared to the as-received un-welded counterpart. The impact of post-weld heat treatment on tensile properties and resultant fracture behavior is presented and briefly discussed in light of intrinsic microstructural effects and nature of loading.

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.

Download or read book Lehrerpensionskasse written by and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructure Evolution During Re heating of 357 Aluminum Alloy and Its Effect on the Flow Properties in a Casting Operation written by Adam E. Kopper and published by . This book was released on 1999 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Cold Working and Annealing on Mechanical Properties Microstructure and Texturing of Aluminum Alloy 3104 written by Tamara Kay McGill-Taylor and published by . This book was released on 1989 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Friction Stir Welding on the Microstructure and Mechanical Behavior of Aluminum Alloy Aa2139 t8 written by Uchechi Chinaka Okeke and published by . This book was released on 2021 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt: The demand for both high-strength and lightweight metals for structural applications to increase vehicle mobility has driven an increase in the research and development of lightweight alloys, including those based on aluminum (Al), to replace commonly-used steel. When alloyed copper (Cu), Al alloys can exhibit high tensile strengths. However, Al-Cu alloys are difficult to join using fusion welding processes due to solidification cracking. To circumvent the issues that arise with fusion welding, friction stir welding (FSW) can be employed. FSW is a solid state joining method that utilizes friction generated heat between a rotating tool and two metal plates to create a joint without the use of additional material. FSW temperatures are lower than the melting point and are historically achieved by controlling the welding speed. The welding temperature has largely been both an uncontrolled and unmonitored variable, which presents an issue when trying to predict or explain the weld microstructures. In addition, most FSW investigations are performed on parts that are less than 12 mm thick. This limits the understanding of processing-microstructure-property relationships of thicker FSW plates. This dissertation studied the effect of FSW on the microstructure and mechanical behavior of 25 mm thick AA2139-T8, a precipitation strengthened Al-Cu-Mg-Ag alloy. Processing-microstructure-property relationships were studied using both constant-speed (150 RPM and 50 mm/min) and constant-temperature FSW (performed at 490 ℗ʻC, 500 ℗ʻC, and 510 ℗ʻC). The microstructural evolution throughout the thickness of the weld was analyzed via optical microscopy, SEM, TEM, and XRD. The mechanical behavior was analyzed using tensile and Vickers hardness experiments. The distribution of the different precipitates was plotted throughout the welded area for the constant-temperature FSW materials. The average matrix grain size decreased from the weld top to bottom, while the precipitate volume percent increased from the weld top to bottom. The stir zone (SZ) exhibited lower strengths and hardness than the base metal. In addition, the larger grains in the upper weld nugget (UWN) of the SZ had a higher hardness than the smaller grains in the lower weld nugget (LWN) of the SZ and this was explained by the dissolution of the precipitates during welding and the associated solid solution strengthening. This study was the first to perform constant-temperature FSW on both an Al-Cu-Mg-Ag alloy and a 25 mm thick plate. Compared with the 500 ℗ʻ and 510 ℗ʻC constant-temperature FSW, the 490 ℗ʻC constant-temperature FSW yielded the smallest average grain size and the highest precipitate volume percent through the SZ. The average grain size increased with welding temperature. The 510 ℗ʻC FSW exhibited the lowest room-temperature (RT) tensile YS, UTS, Îæf, and joint efficiency due to the void formation during the welding. The 490 ℗ʻC and 500 ℗ʻC FSWs failed at the interface between the SZ and the thermomechanically affected zone (TMAZ) and in the HAZ, respectively, which were the weakest links of the weld and dictated the tensile properties. The work in this dissertation provided new insights into the effects of constant temperature FSW on the microstructural evolution and the mechanical properties through the weld thickness. The knowledge gained from this work will not only assist in determining optimal welding parameters for this alloy for targeted applications, but will also serve as a framework for future research targeted at understanding processing-microstructure-property relationships of a variety of metallic systems undergoing not only FSW under controlled conditions but also undergoing different controlled thermomechanical processing treatments.

Download or read book Effect of Chill Condition and Grain Refinement on the Microstructure and Mechanical Properties of B319 Aluminum Alloy written by Vishank Kumar and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Friction Stir Processing on the Microstructure and Tensile Behavior of Aluminum Alloys written by Nelson Gomes Affonseca (Netto) and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Friction Stir Processing (FSP) is a promising thermomechanical technique that is used to modify the microstructure of metals locally, and thereby locally improve mechanical properties of the material. FSP uses a simple and inexpensive tool, and has been shown to eliminate pores and also reduce the sizes of intermetallics in aluminum alloys. This is of great interest for research on solidification, production and performance of aluminum alloy castings because FSP can enhance the structural quality of aluminum casting significantly by minimizing the effect of those structural defects. In the literature, there is evidence that the effectiveness of FSP can change with tool wear of the tool used. Therefore, a study was first conducted to determine the effect of FSP time on the tool life and wear in 6061-T6 extrusions. Results showed the presence of two distinct phases in the tool life and wear. Metallographic analyses confirmed that wear in Phase I was due to fracture of the threads of the tool and Phase II was due to regular wear, mostly without fracture. Moreover, built-up layers of aluminum were observed between threads. The microhardness profile was found to be different from those reported in the literature for 6061-T6, with Vickers hardness increasing continuously from the the stir zone to the base material. To investigate the degree of effectiveness of FSP in improving the structural quality of cast A356 alloys, ingots with different quality (high and low) were friction strir processed with single and multiple passes. Analysis of tensile test results and work hardening characteristics showed that for the high quality ingot, a single pass was sufficient to eliminate the structural defects. Subsequent FSP passes had no effect on the work hardening characteristics. In contrast, tensile results and work hardening characteristics improved with every pass for the low quality ingot, indicating that the effectiveness of FSP was dependent on the initial quality of the metal. The evolution of microstructure, specifically the size and spacing of Silicon (Si) eutectic particles, was investigated after friction stir processing of high quality A356 castings with single and multiple passes. Si particles were found to coarsen with each pass, which was in contrast with previous findings in the literature. The nearest neighbor distance of Si particles also increased with each FSP pass, indicating that microstructure became progressively more homogeneous after each pass. In the literature, the improvement observed after FSP of Al-Si cast alloys was attributed to the refinement of Si particles. Tensile data from high quality A356 ingot showed that there was no correlation between the size of Si particles and ductility. To the author's knowledge, this is the first time that the absence of a correlation between Si particle size and ductility has been found.