预变形对Al-Cu-Mg-(Ag)合金中Ω相析出的影响  

Effect of Pre-deformation on Ω Phase Precipitation in Al-Cu-Mg-(Ag) Alloy

作　　者：潘峥嵘[1] 郑子樵[1] 廖忠全[1] 李世晨[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《热加工工艺》2010年第12期1-3,8,共4页Hot Working Technology

基　　金：2009年国家自然科学基金资助项目(50801067)

摘　　要：通过拉伸性能测试、透射电镜(TEM)观察等手段,研究了固溶淬火后预变形对Al-3.4Cu-0.34Mg合金显微组织的影响。结果表明:人工时效前加入预变形,时效强度明显提高,预变形的加入显著促进了合金中Ω相的析出,牺牲了S′相。与Al-Cu-Mg-Ag合金中预变形抑制Ω相析出作用进行比较,得到了统一的解释:位错能够作为Ω相析出的非均匀形核位置。The microstructure and tensile properties of Al-3.4Cu-0.34Mg deformed and underformed before aging were investigated through tensile test and TEM observation. The results show that the tensile strength of the alloy largely increases by pre-deformation, the precipitation of Ω phase is significantly accelerated at the expense of S＇ phase. These results are compared with the depressed Ω phase by pre-deformation in Al-Cu-Mg-Ag alloy, there comes to an explanation, which is applicable to both alloys： dislocations can act as the heterogeneous nucleation sites for Ω phase.

关 键 词：AL-CU-MG 预变形 位错 Ω相 非均匀形核位置 

分 类 号：TG146.2[一般工业技术—材料科学与工程]