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
潘峥嵘, 郑子樵, 廖忠全, 李世晨
点击：3398次 下载：0次
作者单位：(中南大学 材料科学与工程学院, 湖南 长沙 410083)
中文关键字：Al-Cu-Mg； 预变形； 位错； Ω相； 非均匀形核位置
英文关键字：Al-Cu-Mg; pre-deformation; dislocations; Ω phase; heterogeneous nucleation sites
中文摘要：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。
英文摘要：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.