Effect of Two-Stage Double Peak Aging on Microstructure and Properties in 7050 Aluminum Alloy

Abstract:

The age-hardening precipitation of double peak during two-stage aging process in 7050 aluminum alloy is studied in this paper. The results show that the first peak is strengthened by high-density GP zones, whereas the second aging peak is mainly strengthened by h¢ phases with a certain size, which suggests that the strengthening effect of both h¢ phases and GP zones are better than that of individual GP zones.

• Periodical: Applied Mechanics and Materials (Volumes 157-158)
• Pages: 331-337
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.157-158.331
• Online since: February 2012
• Authors: Chang De He, Jian Ping Ren, Bing Xu
• Keywords: 7050 Aluminium Alloy, Precipitation, Strengthening Mechanism, Two-Stage Double Peak Aging

References

[1] CHEN Xiaoming, SONG Renguo. Study on Double-peak Ageing Process for 7xxx Series Aluminum Alloy [J]. Hot Working Technology，2009，3 8(2)：93-97Song.

[2] R G, W. Dietzel, Zhang B J. W.J. Stress corrosion cracking and hydrogen embrittlement of an Al-Zn-Mg-Cu alloy [J]. Acta Materialia, 2004, 52 (16): 4727-4743.

DOI: 10.1016/j.actamat.2004.06.023

[3] Mukhopadhyay A K, Yang Q B, Singh S R. The influence of zirconium on the early stages of aging of a termary Al-Zn-Mg-Cu alloy[J]. Acta Metall Mater, 1994, 42(9): 3083-3091.

DOI: 10.1016/0956-7151(94)90406-5

[4] Polmear I J. The aging characteristics of comlex Al-Zn-Mg alloys, distinctive effects of copper and silver on aging mechanism[J]. J Inst. Metals, 1960-(1961).

[5] Robson J D. Microstructural evolution in aluminum alloy 7050 during processing[J]. Materials Science and Engineering A, 2004, 382: 112-121.

DOI: 10.1016/j.msea.2004.05.006

[6] Vasudevan A K, Doherty R D. Aluminum alloys contemporary research and application [C]. 1989, 31: 27- 28 Song R G, Zhang Q Z. Heat treatment optimization for 7175 aluminum alloy by genetic algorithm [J]. Materials Science and Engineering C, 2001, C17: 133-136.

DOI: 10.1016/s0928-4931(01)00321-6

[7] Song R G, Zhang Q Z. Heat treatment optimization for 7175 aluminum alloy by genetic algorithm [J]. Materials Science and Engineering C, 2001, C17: 133-136.

DOI: 10.1016/s0928-4931(01)00321-6

[8] Yan Dajing, Zhang Yudong. Effect of Ageing Condition on SCC Resistance and Exfoliation Corrosion Behavior of 7475 and 7050 Al Alloys [J]. Journal of Materials Engineering, 1993, 4(2): 13-16.

[9] Song Renguo, Zhang Baojin. Investigation of Stress Corrosion Susceptibility for 7175 Aluminiun Alloy Double Peak Aged [J]. TRANSACTIONS OF METAL HEAT TREATMENT, 1996, 17(2): 51-54.

[10] CHEN Kang hua. The effect of promotively-solutionizing treatmenton the mechanical properties and fracture of ultra high strength 7055 aluminum alloys[J]. JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY, 2001, 21(6): 528-531.

[11] Knano M, Araki I, Cui Q. precipitation behavior of 7000 alloys during retrogression and reaging treatment [J]. Mater Sci and Technol, 1994, 10(7): 599-602.

DOI: 10.1179/mst.1994.10.7.599

[12] Lin gao-yong, Zhang hui , et al . Influences of processing routine on mechanical properties and structures of 7A04 aluminum alloy thick-plates [J] . Trans Nonferrous Met Soc China, 2003(13): 809 - 813.