Investigations on indentation size effects using a pile-up corrected hardness
- Authors
- Lee, Yun-Hee; Hahn, JunHee; Nahm, Seung Hoon; Jang, Jae il; Kwon, Dongil
- Issue Date
- Apr-2008
- Publisher
- IOP PUBLISHING LTD
- Citation
- JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.41, no.7, pp.1 - 5
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PHYSICS D-APPLIED PHYSICS
- Volume
- 41
- Number
- 7
- Start Page
- 1
- End Page
- 5
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/178813
- DOI
- 10.1088/0022-3727/41/7/074027
- ISSN
- 0022-3727
- Abstract
- Indentation size effects ( ISEs) become severe in the nanoindentation regime because various influencing factors become active in a very shallow indentation regime. Additionally, the general analysis on the nanoindentation curve yields hardness overestimation because it cannot take into account material pile- up around contacts. Thus we tried to investigate intrinsic ISEs in monolithic materials by proposing a new hardness measurement method; the load- supporting contact boundary was approximated as the peak trajectory around an impression and analysed by a radial differentiation of the remnant indent morphology. Dependence of the new load- off hardness on the indentation depth was investigated for ( 1 0 0) tungsten single crystal and fused quartz. The contribution of the material pile- up to the new hardness was clearly modified but more significant hardness increase appeared at a very shallow indentation regime due to severe elastic recovery. These phenomena are discussed with the strain- gradient plasticity model.
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