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杨晓京,赵彪,罗良.单晶锗微纳米尺度脆塑转变机理研究[J].稀有金属材料与工程(英文),2018,47(10):3228~3232.[Yang Xiaojing,Zhao Biao and Luo liang.Research on Brittle-Ductile Transition Mechanism of Single Crystal Germanium in Micro-Nano scale[J].Rare Metal Materials and Engineering,2018,47(10):3228~3232.]
Research on Brittle-Ductile Transition Mechanism of Single Crystal Germanium in Micro-Nano scale
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Received:January 12, 2017  Revised:September 17, 2018
DOI:
Key words: single crystal germanium  anisotropy  scrach test  brittle-ductile transition  critical depth
Foundation item:国家自然科学基金资助(项目号51365021)
Author NameAffiliation
Yang Xiaojing,Zhao Biao and Luo liang  
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Abstract:
      In order to examine the brittle-ductile transition mechanism, nano-scratch experiment was conducted on (100), (110) and (111) crystal plane by using nano-indenter, and scratch morphology was observed by using atomic force microscopy and scanning electron microscope. The critical load and critical depth of brittle-ductile transition of each crystal plane were obtained by analyzing the depth-scratch distance curve and the scratch morphology. The results showed that single crystal germanium has strong anisotropy, the critical load of brittle-ductile transition on (100), (110) and (111) crystal plane are 37.6 mN, 30.5 mN and 32.4 mN, the critical depths are 594.7 nm, 512.5 nm and 536.6 nm respectively. A most plastic remove and least brittle-ductile transition on (100) crystal plane during the process of nano-scratch is due to its minimum hardness and deepest depth of brittle-ductile transition, and with the increase of speed of scratches, critical depth and critical load of brittle-ductile transition are increased. At last, the correctness of critical load and critical depth of brittle-ductile transition was verified through constant load scratch experiments.