Microstructural evolution and mechanical properties in Cu48Zr48Al4 bulk metallic glass composites induced by He+ ion irradiation

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:428

Article

Wei, Yuhang^1,2  Zhang, Kun^1,2  Wei, Bingchen^1,2  Zhao, Ziqiang³  Yuan, Junming⁴ 

[1] Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Natl Micrograv Lab, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China

[3] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[4] North Univ China, Sch Environm & Safety Engn, Taiyuan 030051, Shanxi, Peoples R China

关键词: Ion irradiation;    Metallic glass composites;    Martensitic transformation;    Nanoindentation;   

DOI  :  10.1016/j.nimb.2018.05.003

来源: Elsevier

【 摘 要 】

The irradiation-induced phase transformation and mechanical property stability of the Cu48Zr48Al4 bulk metallic glass composites (BMGCs) were investigated. An obvious structural transformation occurred from the B2-CuZr phase to the B19'-CuZr and the B33-CuZr phases following irradiation, when the dose increased from 2.5 x 10(17) ions/cm(2) to 1.0 x 10(18) ions/cm(2). This change was accompanied by the changes of the maximum displacement per atomic (DPA) increasing from 21.5 dpa to 86 dpa. The mean surface roughness increased as the incident dose increased. The local exfoliation occurred at the maximal dose. The changes of mechanical properties were characterized via nanoindentation. The hardness and Young's modulus in the amorphous regions decreased as the dose increased. In contrast, the crystalline regions presented a distinct hardening effect, due to the appearance of the martensitic phases. The macroscopic hardness of the BMGCs obtained by the Vickers indentation instrument was basically unchanged after irradiation. The results suggested that these materials maintained a stable performance, because of the combined effects of hardening and softening. This study could aid the design of novel materials that are subjected to irradiation circumstance.

【 授权许可】

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