Microstructural evaluation and mechanical properties of 7075 aluminum alloy prepared by controlled diffusion solidification
Microstructural evaluation and mechanical properties of 7075 aluminum alloy prepared by controlled diffusion solidification作者机构：State Key Laboratory ofAdvanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou 730050 China Key Lab of Non-ferrous Metal Alloys and Processing Ministry of Education Lanzhou University of Technology L anzhou 730050 China
出 版 物：《China Foundry》 (中国铸造（英文版）)
年 卷 期：2019年第16卷第4期
页 面：238-247页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
主 题：primary α-Al phase eutectic phase solute atoms tensile strength elongation
摘 要：In the present work, 7075 aluminum alloy(Al-Zn-Mg-Cu) was produced by both conventional casting(CC) and controlled diffusion solidification(CDS) methods. Each sample was subjected to different heat-treatment conditions: as-cast, T4, and T6;and their microstructural and mechanical properties were investigated by optical microscopy(OM), scanning electron microscopy(SEM) and X-ray diffractometry(XRD). It was found that CDS promoted the formation of non-dendritic primary α-Al phase and reduced shrinkage porosity, thus resulting in improved mechanical properties. In addition, the eutectic phase of the CDS samples mainly consisted of T(Al-ZnMg-Cu) phase, which manifested a well-developed lamellar eutectic structure. However, in the CC samples, the T(Al-Zn-Mg-Cu) phase was composed of rod-like eutectics. Moreover, the θ(Al2 Cu) eutectic contents in the CC samples were greater than those in the CDS samples. Each element in the CC samples had an obvious change in the grain boundary, whereas the change in element content in the CDS samples was gradual. Therefore, the non-dendritic morphology of the primary phase and the presence of rod-like eutectics in the matrix of the CDS samples led to enhanced tensile strength and elongation under different heat treatment conditions.
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