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皮锦红,严亚楠,汪荣香,吴继礼.玻璃态Cu29Zr32Ti15Al5Ni19在纳米压入过程中的压痕尺寸效应及应变硬化现象[J].稀有金属材料与工程(英文),2019,48(3):744~750.[Jin-Hong Pi,Ya-Nan Yan,Rong-Xiang Wang and Ji-Li Wu.Indentation size effects and strain hardening of glassy Cu29Zr32Ti15Al5Ni19 during nanoindentation[J].Rare Metal Materials and Engineering,2019,48(3):744~750.]
Indentation size effects and strain hardening of glassy Cu29Zr32Ti15Al5Ni19 during nanoindentation
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Received:October 11, 2017  Revised:February 20, 2019
DOI:
Key words: high entropy alloy  nanoindentation  indentation size effect  strain hardening
Foundation item:国家自然科学基金项目 (51601089);江苏省大学生创新训练项目(TB201702018)
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Jin-Hong Pi,Ya-Nan Yan,Rong-Xiang Wang and Ji-Li Wu  
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Abstract:
      A high entropy bulk metallic glass (HE-BMG) Cu29Zr32Ti15Al5Ni19 was investigated by nanoindentation in detail with load-controlled, continuous stiffness measurement (CSM) and cyclic loading mode, respectively. Pop-in occurs in this alloy during nanoindentation. Applied load have more influences on the pop-in events than loading rate does. When the applied load is larger than 40mN, obvious pop-in events can be observed in the loading curves even at high up to 5mN/s loading rate. Indentation size effect exists in this alloy, confirmed by the hardness decreasing with the increasing indentation load and a Meyer’s index n less than 2. The fraction of energy dissipated during indentation (Ed) changes within the range of 54%-60%. Cyclic loading tests reveal obvious hardening effect.