Download or read book Analysis of Thermal Treatments for the 7075 7091 Aluminum Alloys written by E. S. Tankins and published by . This book was released on 1984 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Retrogression and re-aging (RRA) is a thermal treatment applied to 7000 series aluminum alloys in order to improve their stress corrosion cracking resistance while maintaining the peak strength of the T-6 temper. In the present work, 7075 and 7091 were retrogressed at temperatures between 160 C and 240 C and aged for 24 hours at 120 C. The hardness and conductivity data obtained were compared to and contrasted with the alloy's normal aging profile. Results indicate that RRA treatment is effective at retrogression temperatures lower than previously reported and that retrogression appears to be kinetically dominated (i.e. data fits a first order dissolution model). The aforementioned results should enable the RRA process to be expanded to thick plates.

Download or read book Study of Heat Treatment Aging Process Parameters for 7050 and 7075 Aluminum Alloys written by Ambarneil Roy and published by . This book was released on 2020 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Room Temperature Tensile Properties of Large 7075 T6 and 7075 T73 Aluminum alloy Forgings written by D. P. Moon and published by . This book was released on 1970 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Room-temperature tensile properties were determined for large 7075-T6 and 7075-T73 aluminum-alloy forgings. Forging sizes ranged from about 1.5 to 15 inches (short-transverse direction) for production forgings and up to 20 inches for step forgings. Heat-treated thickness was 0.75 to 1.000 inch for the T6 temper but ranged up to 10 inches for the T73 temper. Regression coefficients and standard d deviations are presented for three properties (TUS, TYS, and elongation) in each of three test directions. In addition, average values and two statistical minima are tabulated for each property and test direction at each of several discrete sizes, and a comparison is made with the corresponding requirements of Specification MIL-A-22771C(ASG). (Author).

Download or read book Fatigue Life Analysis of 6061 T6 and 7075 T6 Aluminum Alloys After Retrogression Head Treatment and Thermomechanical Treatment written by Xaver Neumeyer and published by . This book was released on 2006 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1987 with total page 746 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of Constituent Dispersoid and Hardening Particles in the Fracture of 7075 Aluminum Alloys written by Joseph S. Santner and published by . This book was released on 1977 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ten different alloys based on the 7075 composition are used to study the effect of purity level, dispersoid type, and heat treatment on 7075's fracture toughness. Five different purity levels ranging from 0.30 w/o to 0.30 w/o Fe+Si and two different dispersoid types were investigated. Each alloy was given two different heat treatments with both the longitudinal and the long-transverse directions tested. The notched round tensile test was modified to give the 'plastic energy per unit area'. This parameter used for ranking fracture toughness gave the same results as the total energy per unit area measured on precracked Charpy specimens. Moreover, the fracture toughness ranking for these ten alloys was the same in the longitudinal and long-transverse directions. This suggests the elongated distribution of constituent particles in the rolling direction does not change the failure mechanism. Fractographic evidence showed a clear difference in the fracture topography between the ten alloys. An analysis of variance demonstrated that heat treatment was the most significant variable investigated that affects fracture toughness. This result supports a two-stage ductile fracture failure mechanism which suggests that the dispersoid and hardening particles are primarily responsible for the fracture toughness of the higher purity aluminum alloys used by the aerospace industry today. (Author).

Download or read book Response of 7075 and 7050 Aluminium Alloys to High Temperature Pre precipitation Heat Treatment written by Olayinka Tehinse and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Al-Zn-Mg-Cu (7xxx series) aluminium alloys are widely used for aircraft structures. It is difficult to obtain a combination of optimal strength and stress corrosion cracking (SCC) resistance for these alloys. It appears that SCC resistance of these alloys is related to grain boundary precipitate morphology. One technique to control the grain boundary precipitate morphology is to introduce a controlled cooling procedure referred to as High Temperature Pre-precipitation (HTPP) treatment following the solution heat treatment. There is need for a detailed study of the effect of HTPP on the properties of commercial Al-Zn-Mg-Cu alloys using different intermediate temperatures. In this thesis research, the results of ten HTPP processes applied to 7075 and 7050 commercial 7xxx series alloys are presented in terms of hardness, electrical conductivity, corrosion resistance, TEM analysis of grain boundary precipitate morphology and EDS analysis of solute concentration profile at the grain boundary. Results indicate that subsequent to HTPP processing, the 7050 alloy can be precipitation aged to a higher hardness compared to 7075; this result is associated with the modification of 7050 alloy by zirconium versus chromium in 7075 alloy. HTPP heat treatment achieves better SCC resistance compared to standard T6 temper. However, it does not appear that HTPP can achieve a combination of hardness, electrical conductivity and corrosion resistance superior to standard T6 and T7X tempers.

Download or read book Heat Treating 1998 Proceedings of the 18th Conference Including the Liu Dai Memorial Symposium written by Harry W. Walton and published by ASM International. This book was released on 1999-01-01 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of the Effects of Heat Treatments on the Mechanical and Corrosion Properties of Aluminum Alloy 7075 written by Keagan P. Clement and published by . This book was released on 2019 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface Analysis of 2024 and 7075 Aluminum Alloys After Conditioning by Chemical Treatments written by Neil T. McDevitt and published by . This book was released on 1975 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation was carried out to determine the effect of various chemical treatments on the surface of 2024-T3 and 7075-T6 bare aluminum alloys. After treatment various chemical elements can be found on the surface arising from the alloy constituents, the chemical solution or tap water rinse. The chemical signature of each surface should be known to assess adhesive bond durability.

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 Vertification of The t73 Heat Treatment of 7075 Aluminum Alloy by Nondestructive Methods written by D. HAGEMAIER and published by . This book was released on 1963 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Exfoliation Corrosion Testing of 7178 and 7075 Aluminum Alloys written by PW. Jeffrey and published by . This book was released on 1972 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: As special heat treatments to improve resistance of aluminum alloys to exfoliation were developed, the need for accelerated testing methods to control production heat treatment arose. A joint task group formed by ASTM Committee GO1.05 and the Aluminum Association has conducted an interlaboratory testing program of various salt spray and immersion tests for 7000 series alloys. A constant immersion test produced the best results.

Download or read book Calorimetric Study of Precipitation in a Commercial 7075 Aluminum Alloy written by Philip Adler and published by . This book was released on 1971 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specific heat, hardness, and transmission electron microscopy were used to evaluate the solid state reactions related to solution and aging heat treatments and their effect on mechanical strengthening. Calorimetric studies indicate three endothermic and two exothermic reactions on heating from 25C to 470C. The endotherms are due to reversion of GP zones (P sub 1), dissolution of intermediate MgZn2 type precipitate, eta', (P sub 3), and dissolution of the stable MgZn2 type precipitate, eta', (P sub 5); exotherms (P sub 2), and (P sub 4) accompany precipitation of the eta' and eta', respectively. Energies associated with P sub 1 and P sub 2 + P sub 4 increased with solution treatment temperature and time, while that P sub 5 decreased. Hardness also increased with higher heat input during solution treatment and was found to be a function of GP zone concentration. The results suggest that maximum strength is based on the partition of excess solute between internal surface defects and GP zones. Precipitation at these defects depletes matrix solute and reduces attainable strength. (Author).

Download or read book Process Control evaluation of Alcoa s New Artificial Aging Treatment for 7079 Aluminum Alloy written by W. A. TOKEN and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two step aging treatment can be applied immediately after quenching from the solution heat treatment temperature, or after stretching or forming in the 7079-W temper and produce mechanical properties comparable to those obtained using the present aging treatment. This new procedure can be considered as an alternate to the practice described in MIL-H-6088B. Data on time delay between solution heat treatment and artificial aging of 7075 and 7178 is included. Immediate artificial aging of aluminum alloys, 7075 and 7178, does not produce marked differences of mechanical properties as compared with one, five, or ten day delay. (Author).

Download or read book Properties of a Retrogressed and Re Aged 7075 Aluminum Alloy written by E. S. Tankins and published by . This book was released on 1984 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: Retrogression and Re-aging (RRA) is a new thermal process introduced for the purpose of enhancing corrosion resistance of 7075-T651 aluminum alloy while maintaining its T6 strength. In this study a 7075 material so treated was investigated for its mechanical and corrosion resistant properties. Results indicated that the RRA treated 7075 was significantly better than the T6 temper in resistance to stress corrosion cracking and exfoliation corrosion. The loss in strength from RRA treatment was minimal. Electron microscopy of the fractured surface showed a distinct difference in the fracture mode when compared to the T6 temper condition. Tests results indicated that the RRA heat treatment resulted in fatigue and fracture toughness properties superior to the 7075-T651. Keywords: SEM fractography, Differential scanning colorimetry, Hardness, Conductivity, Fracture toughness, Fatigue, and Crack propagation.