Achieving strength-ductility synergy in cold spray additively manufactured Al/B_4C composites through a hybrid post-deposition treatment

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英文篇名：Achieving strength-ductility synergy in cold spray additively manufactured Al/B_4C composites through a hybrid post-deposition treatment 作者：Naeem ; ul ; Haq ; Tariq ; Lawrence ; Gyansah ; Xiang ; Qiu ; Chunni ; Jia ; Hasan ; Bin ; Awais ; Chengwu ; Zheng ; Hao ; Du ; Jiqiang ; Wang ; Tianying ; Xiong 英文作者：Naeem ul Haq Tariq;Lawrence Gyansah;Xiang Qiu;Chunni Jia;Hasan Bin Awais;Chengwu Zheng;Hao Du;Jiqiang Wang;Tianying Xiong;Institute of Metal Research,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Department of Metallurgy and Materials Engineering,Pakistan Institute of Engineering and Applied Sciences;School of Materials Science and Engineering,University of Science and Technology of China; 英文关键词：Cold spray additive manufacturing;;Post-deposition treatments;;Al/B_4C composites;;Dynamic recrystallization;;Mechanical properties 中文刊名：CLKJ 英文刊名：材料科学技术(英文版) 机构：Institute of Metal Research,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Department of Metallurgy and Materials Engineering,Pakistan Institute of Engineering and Applied Sciences;School of Materials Science and Engineering,University of Science and Technology of China; 出版日期：2019-06-15 出版单位：Journal of Materials Science & Technology 年：2019 期：v.35 基金：supported financially by the National Natural Science Foundation of China(No.51671205) 语种：英文; 页：CLKJ201906013 页数：11 CN：06 ISSN：21-1315/TG 分类号：99-109

摘要

Cold spray additive manufacturing(CSAM) provides a potential solid state manufacturing route to fabricate variety of aluminum matrix composites(AMCs) with reduced possibility of undesired chemical reactions and residual thermal stresses. This study presents a hybrid(i.e. hot compression + hot rolling)post-deposition treatment to reinvigorate the mechanical properties of cold spray additively manufactured Al/B4 C composites. The as-deposited samples were initially subjected to 30% thickness reduction via hot compression treatment at ~500°C followed by a hot rolling treatment with 40% thickness reduction in 2 passes. Electron backscatter diffraction(EBSD) and high resolution transmission electron microscopy(HRTEM) results revealed that after hybrid post-deposition treatment(involving 70%accumulative thickness reduction), the aluminum grains in the matrix were extensively refined due to simultaneous operation of continuous dynamic recrystallization(CDRX) and geometric dynamic recrystallization(GDRX). Furthermore, interfacial defects were remarkably reduced while the nature of Al/Al and Al/B_4C interfacial bonding was changed from sheer mechanical interlocking to metallurgical bonding which facilitated efficient transference of applied load to uniformly dispersed bimodal B_4C particles. As a result, ultimate tensile strength(UTS) and elongation(EL) of the as-deposited sample were simultaneously improved from ~37 to 185 MPa and ~0.3% to 6.2%, respectively.
        Cold spray additive manufacturing(CSAM) provides a potential solid state manufacturing route to fabricate variety of aluminum matrix composites(AMCs) with reduced possibility of undesired chemical reactions and residual thermal stresses. This study presents a hybrid(i.e. hot compression + hot rolling)post-deposition treatment to reinvigorate the mechanical properties of cold spray additively manufactured Al/B4 C composites. The as-deposited samples were initially subjected to 30% thickness reduction via hot compression treatment at ~500°C followed by a hot rolling treatment with 40% thickness reduction in 2 passes. Electron backscatter diffraction(EBSD) and high resolution transmission electron microscopy(HRTEM) results revealed that after hybrid post-deposition treatment(involving 70%accumulative thickness reduction), the aluminum grains in the matrix were extensively refined due to simultaneous operation of continuous dynamic recrystallization(CDRX) and geometric dynamic recrystallization(GDRX). Furthermore, interfacial defects were remarkably reduced while the nature of Al/Al and Al/B_4C interfacial bonding was changed from sheer mechanical interlocking to metallurgical bonding which facilitated efficient transference of applied load to uniformly dispersed bimodal B_4C particles. As a result, ultimate tensile strength(UTS) and elongation(EL) of the as-deposited sample were simultaneously improved from ~37 to 185 MPa and ~0.3% to 6.2%, respectively.

引文

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