J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (6): 1053-1063.DOI: 10.1016/j.jmst.2018.12.022

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Achieving strength-ductility synergy in cold spray additively manufactured Al/B4C composites through a hybrid post-deposition treatment

Naeem ul Haq Tariqabc, Lawrence Gyansahab, Xiang Qiuad, Chunni Jiaad, Hasan Bin Awaisc, Chengwu Zhenga, Hao Dua, Jiqiang Wanga*(), Tianying Xionga()   

  1. a Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    b University of Chinese Academy of Sciences, Beijing 100049, China
    c Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan
    d School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
  • Received:2018-09-24 Revised:2018-11-19 Accepted:2018-11-30 Online:2019-06-20 Published:2019-06-19
  • Contact: Wang Jiqiang
  • About author:

    1The authors contributed equally to this work.

Abstract:

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/B4C 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/B4C interfacial bonding was changed from sheer mechanical interlocking to metallurgical bonding which facilitated efficient transference of applied load to uniformly dispersed bimodal B4C 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.

Key words: Cold spray additive manufacturing, Post-deposition treatments, Al/B4C composites, Dynamic recrystallization, Mechanical properties