通过对高温拉伸强度、延伸率、高温持久时间的测试以及SEM、TEM观察表明:Ag含量的增加显著提高合金在高温拉伸时的强度和高温持久强度极限;合金在高温下的断裂仍为塑性穿晶断裂;Ag含量越大,合金中析出的Ω相的数量越多,经长时间高温之后,其粗化程度不大,仍为主要强化相.
Effect of Ag content on the evaluated-temperature mechanical properties of a series of Al-Cu-Mg-Ag alloys was studied by means of tensile tests, endurance tests, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that tensile strength and ultimate endurance strength increased dramatically with Ag content increasing. SEM observations suggest a plastic transgranular manner of tensile fractures. TEM results reveal that increasing Ag content promoted the nucleation of the Ω phase, which was the dominant strengthening phase in matrix. Furthermore, Ω precipitates were not coarsened on a large scale after long time endurance at evaluated temperature.
参考文献
| [1] | Ringer S P et al.[J].Acta Metallurgica Et Materialia,1994,42(05):1715. |
| [2] | Ringer S P et al.[J].Acta Materialia,1997,45(09):3731. |
| [3] | Polmear I J et al.[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1988,19A(04):1027. |
| [4] | Polmear I J .[J].Materials Transactions-Japan Institute of Metals,1996,37(01):12. |
| [5] | Ringer S P et al.[J].Materials Science and Engineering A,1996,A217-21:273. |
| [6] | Sofyan B T et al.[J].MICRON,2001,32(08):851. |
| [7] | 肖代红,王健农,陈世朴,丁冬雁.微量Ag对Al-5.3Cu-0.8Mg合金组织和耐热性能的影响[J].机械工程材料,2003(01):38-40. |
| [8] | 黄兰萍,陈康华,郑子樵,黄永平.微量Ag,Mg对Al-Cu-Li合金时效特性和显微组织的影响[J].稀有金属材料与工程,2005(08):1322-1325. |
| [9] | Zahra A M et al.[J].Philosophical Magazine,2004,84(24):2521. |
| [10] | 肖代红,宋旼,陈康华.Cu,Mg含量对Al-xCu-yMg-0.6Ag合金力学性能的影响[J].粉末冶金材料科学与工程,2007(04):228-233. |
| [11] | 王祝堂;田荣璋.铝合金及其加工手册[M].长沙:中南工业大学出版社,2003:197. |
| [12] | Ringer S P et al.[J].Acta Materialia,1996,44(05):1883. |
| [13] | C.R. HUTCHINSON;X. FAN;S.J. PENNYCOOK .ON THE ORIGIN OF THE HIGH COARSENING RESISTANCE OF #OMEGA# PLATES IN Al-Cu-Mg-Ag ALLOYS[J].Acta materialia,2001(14):2827-2841. |
| [14] | L.Reich;M.Murayama;K.Hono .Evolution of Ω phase in an Al-Cu-Mg-Ag alloy- a three-dimensional atom probe study[J].Acta materialia,1998(17):6053-6062. |
| [15] | 陈志国 et al.[J].中南矿冶学院报,1994,25(06):723. |
| [16] | 张俊善.材料的高温变形与断裂[M].北京:科学出版社,2007:229. |
| [17] | Yousefiani A et al.[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2000,31A(11):2807. |
| [18] | Svoboda J et al.[J].Acta Metallurgica Et Materialia,1990,38(06):1141. |
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