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Title: Extending the range of constant strain rate nanoindentation testing

Journal Article · · Journal of Materials Research
ORCiD logo [1];  [2];  [2]
  1. Friedrich-Alexander-Univ. Erlangen-Nürnberg (FAU) (Germany); Texas A & M Univ., College Station, TX (United States); Texas A&M University
  2. Texas A & M Univ., College Station, TX (United States)
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Constant strain rate nanoindentation hardness measurements at high sustained strain rates cannot be made in conventional nanoindentation testing systems using the commonly employed continuous stiffness measurement technique (CSM) because of the “plasticity error” recently reported by Merle et al. [Acta Mater.134, 167 (2017)]. To circumvent this problem, here we explore an alternative testing and analysis procedure based on quasi-static loading and an independent knowledge of the Young's modulus, which is easily obtained by standard nanoindentation testing. In theory, the method applies to any indentation strain rate, but in practice, an upper limit on the rate arises from hardware limitations in the testing system. The new methodology is developed and applied to measurements made with an iMicro nanoindenter (KLA, Inc.), in which strain rates up to 100 s-1 were successfully achieved. The origins of the hardware limitations are documented and discussed.

Research Organization:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
German Research Foundation (DFG); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003857
OSTI ID:
1608123
Journal Information:
Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 4 Vol. 35; ISSN 0884-2914
Publisher:
Materials Research SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE
high strain rate
high velocity
nanoindentation