采用硬度测试、拉伸力学性能测试、XRD衍射物相分析以及α(Al)基体点阵常数的测量等方法对7075铝合金超长时间时效行为、力学性能、应力腐蚀(SCC)敏感性及组织进行了研究.结果表明,7075铝合金的硬度及强度都具有时效双峰特征.两个时效峰的硬度和强度相差不多,但对应第二峰时效的合金具有高强度低SCC敏感性等优异性能.第二峰强化相主要是充分析出的η'相(MsZN_2).
The aging behavior,mechanical properties and micriostructure of 7075 aluminum alloy after aging for long time were studied by means of hardness test,tensile test and X-ray diffraction (XRD). The results show that the hardness and tensile strength of the alloy exhibit double peaks fearure. Although the hardness and strength of two peaks is almost equal,the stress corrosion resistance of the alloy at the aecond aging peak is higher than that at the first aging peak. The microstructure with high density GP zones is correspondent to the first aging peak,whereas the microstructure of the alloy at the second aging peak is featured by the sufficient precipitation of η'(MgZN_2) phase.
参考文献
| [1] | 戴晓元,夏长清,刘昌斌,古一.固溶处理及时效对7xxx铝合金组织与性能的影响[J].材料热处理学报,2007(04):59-63. |
| [2] | 潘复生;张丁非.铝合金及应用[M].北京:化学工业出版社,2006:59-118. |
| [3] | 陈小明,宋仁国,李杰.7xxx系铝合金的研究现状及发展趋势[J].材料导报,2009(03):67-70. |
| [4] | 影响铝合金固溶保温时间的多因素相关规律[J].中国有色金属学报,1999(01):79. |
| [5] | 黄振宝,张新明,刘胜胆,刘文辉,张翀,高慧.固溶处理对7A55铝合金的组织和力学性能的影响[J].材料热处理学报,2007(01):87-91. |
| [6] | Tanner DA;Robinson JS .Residual stress magnitudes and related properties in quenched aluminium alloys[J].Materials Science and Technology: MST: A publication of the Institute of Metals,2006(1):77-85. |
| [7] | 阎大京.从7475铝合金的时效看A1-Zn-Mg-Cu系合金的强化[J].材料工程,1992(02):15. |
| [8] | Song RG;Dietzel W;Zhang BJ;Liu WJ;Tseng MK;Atrens A .Stress corrosion cracking and hydrogen embrittlement of an Al-Zn-Mg-Cu alloy[J].Acta materialia,2004(16):4727-4743. |
| [9] | Loffler H;Kovace I;Lendvai J .Decomposition procesaes in Al-Zn-Mg alloys[J].Journal of Materials Science,1992,27(07):4772. |
| [10] | Knano M;Araki I;Cui Q .Precipitation behavior of 7000 alloys during retrogression and reaging treatment[J].Materials Science and Technology,1994,10(07):599. |
| [11] | 科瓦索夫;弗里德良捷尔.工业铝合金[M].北京:冶金工业出版社,1981 |
| [12] | 杜爱华,龙晋明,裴和中.高强铝合金应力腐蚀研究进展[J].中国腐蚀与防护学报,2008(04):251-256. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%