Influence of second phases on mechanical properties of spray-deposited Al–Zn–Mg–Cu alloy
Influence of second phases on mechanical properties of spray-deposited Al–Zn–Mg–Cu alloy
复制标题
DOI：
10.1016/j.matdes.2012.03.049
复制
发表时间：
2012-09
影响因子：
8.4
通讯作者：
Yandong Jia;F. Cao;Z. Ning;Shu Guo;P. Ma;Jianfei Sun
中科院分区：
文献类型：
--
作者：
Yandong Jia;F. Cao;Z. Ning;Shu Guo;P. Ma;Jianfei Sun
Al-10.66Zn-2.48Mg-1.41Cu-0.17Zr-0.17Sc（wt.%）对喷射沉积制备的合金进行了不同热变形量的热处理。研究了其力学性能和组织演变规律。结果表明，两步热变形可获得均匀的抗拉强度774 MPa，屈服强度734 MPa，延伸率13.7%，比一步热变形分别提高2.7%、3.82%和95%。显微组织观察表明，伸长率的增加主要归因于较高的体积分数的较小的析出物和减少应力集中区域的结果，粗第二相的消失。两步热变形拉伸试样断口呈现韧窝断口特征。强度的提高主要归因于析出强化和弥散强化。
Al–10.66Zn–2.48Mg–1.41Cu–0.17Zr–0.17Sc (wt.%) alloy prepared by spray deposition was processed with different hot deformation followed by heat treatment. The mechanical properties and microstructure evolution were investigated. The results indicate that uniform ultimate tensile strength of 774MPa, yield strength of 734MPa and elongation of 13.7% are obtained with two-step hot deformation, which increase by 2.7%, 3.82% and 95% compared with one-step hot deformation. Microstructural observations show that increase of elongation is mainly ascribed to high volume fraction of smaller precipitates and reduction of stress concentration areas as a result of disappearance of the coarse second phases. The fractured tensile specimens with two-step hot deformation exhibit dimple fractographic features. Improvement of strength is attributed to the precipitation strengthening and dispersed strengthening.