The effect of Cu addition and solution heat treatment on the microstructure, hardness and tensile properties of Al-15%Mg2Si-0.15%Li composite
The effect of Cu addition and solution heat treatment on the microstructure, hardness and tensile properties of Al-15%Mg2Si-0.15%Li composite
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DOI：
10.1016/j.msea.2013.03.066
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发表时间：
2013-08-01
期刊：
影响因子：
6.4
通讯作者：
Tavighi, K.
中科院分区：
文献类型：
--
作者：
Emamy, M.;Emami, A. R.;Tavighi, K.
本研究旨在研究Cu添加量(0.1-3 wt%)对Al-15%Mg2Si-0.15%Li原位金属基复合材料固溶热处理前后显微组织、硬度和拉伸性能的影响。研究发现，较高浓度 (> 1 wt%) 的 Cu 会导致在晶胞边界偏析形成硬质富铜金属间化合物，从而增强极限拉伸强度 (UTS) 值，但会降低伸长率 (EI%)。进一步的结果表明，固溶热处理部分溶解了不同类型的金属间化合物，从而导致此类硬质颗粒的适当分布和延展性增强。通过扫描电子显微镜（SEM）对热处理样品的断裂表面进行研究，发现细小的韧窝是延性断裂模式的主要特征。 (C) 2013 Elsevier B.V. 保留所有权利。
This study has been carried out to investigate the effect of Cu addition (0.1-3 wt%) on the microstructure, hardness and tensile properties of Al-15%Mg2Si-0.15%Li in-situ metal matrix composite before and after solutionizing heat treatment. It was found that the presence of Cu at higher concentrations ( > 1 wt%) results in the formation of hard Cu-rich intermetallics segregated in cell boundaries which intensifies ultimate tensile strength (UTS) values, but reduces elongation percentage (EI%). Further results revealed that solution heat treatment partially dissolves different types of intermetallics which leads to proper distribution of such hard particles and ductility enhancement. The study of the fracture surfaces of the heat treated specimens via scanning electron microscopy (SEM) revealed fine dimples which are the main characteristic of ductile fracture mode. (C) 2013 Elsevier B.V. All rights reserved.