Effect of pre-deformation on microstructures and mechanical properties of high purity Al-Cu-Mg alloy  

预变形对高纯Al-Cu-Mg合金组织和力学性能的影响（英文）

作　　者：李慧中[1,2,3] 刘若梅[1] 梁霄鹏[1,2] 邓敏[1] 廖慧娟[1] 黄岚[2] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083 [3]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第6期1482-1490,共9页中国有色金属学报（英文版）

基　　金：Project(51301209)supported by the National Natural Science Foundation of China

摘　　要：The effects of pre-deformation following solution treatment on the microstructure and mechanical properties of aged high purity Al-Cu-Mg alloy were studied by tensile test, micro-hardness measurements, transmission electron microscopy and scanning electron microscopy. The micro-hardness measurements indicate that compared with un-deformed samples, the peak hardness is increased and the time to reach peak hardness is reduced with increasing pre-strain. Additionally, a double-peak hardness evolution behavior of cold-rolled （CR） samples was observed during aging. The results of TEM observation show that the number density of S′（Al2CuMg） phase is increased and the size is decreased in CR alloy with increase of pre-strain. The peak hardness and peak strength of the CR alloy are increased because of quantity increasing and refinement of S′ phase and high density dislocation.通过拉伸测试、硬度测试、扫描电镜以及透射电镜等手段,研究预变形对高纯Al-Cu-Mg合金180°C时效后组织和力学性能的影响。结果表明:与未预变形的样品相比,随着预轧制量的增加,预轧制后样品的峰值硬度值逐渐增加,而达到峰值硬度所需的时间也逐渐缩短。此外,在预变形的合金时效过程中观察到双峰硬化现象。TEM的研究结果表明,经冷轧变形的合金随着预变形量的提高,合金中S′(Al_2CuMg)相的密度增大,尺寸减小,这种高密度、细小的S′相以及高密度位错是导致合金峰值硬度和强度提高的主要原因。

关 键 词：Al-Cu-Mg alloy PRE-DEFORMATION age strengthening PRECIPITATION MICROSTRUCTURE mechanical properties 

分 类 号：TG146.21[一般工业技术—材料科学与工程]