Microstructure and mechanical properties of Al-Fe-V-Si aluminum alloy produced by electron beam melting

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• 作者：Shaobo Sun ; Lijing Zheng ; ^{zhenglijing@buaa.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Hui Peng ; Hu Zhang
• 关键词：Electron beam melting ; Al-Fe-V-Si alloy ; Microstructure ; Mechanical properties
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：6 April 2016
• 年：2016
• 卷：659
• 期：Complete
• 页码：207-214
• 全文大小：6575 K

文摘

Atomized, pre-alloyed Al-8.5Fe-1.3V-1.7Si (wt%) powder was used to fabricate solid components by electron beam melting (EBM). The residual porosity, chemical composition, microstructure and mechanical properties have been investigated. Results show that the relative density of as-built alloy under the optimized processing parameters was 98.2%. Compare to the initial alloy powder, the EBM parts demonstrated a restricted aluminum loss (~1 wt%) and a quite low oxygen pickup. The microstructure of the deposits was non-uniform. The fusion zone and heat affected zone exhibited a large number of fine spherical Al₁₂(Fe,V)₃Si particles (30–110 nm) distributed uniformly in the α-Al matrix. Some coarser Fe- and V-riched rectangle-like Al_mFe phase (m=4.0–4.4) with 100–400 nm in size was precipitated in the melting boundary zone. The microhardness of the EBM samples was 153 HV in average. The average ultimate tensile strength (UTS) reached 438 MPa with the elongation of 12%. A ductile fracture mode of the tensile specimens was also revealed.