采用光学显微镜(OM)、能谱分析(EDS)及X射线衍射(XRD)研究了铸态Mg-6Al-1 5Ca合金显微组织,并测试了合金的高温蠕变性能.结果表明:该合金由呈枝晶形貌的α-Mg基体和沿晶界分布的Al2Ca共晶相组成;通过幂律蠕变方程得出在150～200℃/50～90MPa下合金蠕变变形机制为扩散控制的高温位错攀移和晶界滑移机制;蠕变断裂行为可以用Monkman-Gran经验公式来描述,175℃蠕变断裂特征为脆性穿晶断裂.
参考文献
| [1] | Mihriban O. Pekguleryuz;Eric Baril .Creep Resistant Magnesium Diecasting Alloys Based on Alkaline Earth Elements[J].Materials transactions,2001(7):1258-1267. |
| [2] | A. A. Luo .Recent magnesium alloy development for elevated temperature applications[J].International Materials Reviews,2004(1):13-30. |
| [3] | Pekguleryuz M.O.; .Development of Creep Resistant Magnesium Diecasting Alloys[J].Materials Science Forum,2000(0):131-140. |
| [4] | Spigarelli S;Cabibbo M;Evaangelista E et al.Analysis of the creep behaviour of thixoformed AZ91 magnesium alloy[J].Materials Science and Engineering,2000,A289 |
| [5] | B. Q. Han;D. C. Dunand .Creep of magnesium strengthened with high volume fractions of yttria dispersoids[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2001(1/2):235-244. |
| [6] | 王珊玲,沈保罗,高升吉,李达,涂铭旌,于维成,姚戈.ZL107合金的高温静态蠕变和循环蠕变[J].中国有色金属学报,2001(04):626-630. |
| [7] | 刘丕林;王中光 .SiC增强2024Al及6061Al合金复合材料的高温蠕变与循环蠕变行为[J].,1997,33(11):1227-1232. |
| [8] | Lagneborg R;Bergman B .Stress/creep rate behaviour of precipitation hardened alloys[J].Sci Met,1976,20-28:10. |
| [9] | Monkman F C;Grant N J .An empirical relationship between rupture life and minimum creep rate in creep rupture tests[J].Proc ASTM,1956,56:593-620. |
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