Dislocation Activity Under Nanoscale Contacts Prior to Discontinuous Yield

Michael R. Maughan; David F. Bahr

doi:10.1080/21663831.2014.961663

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Dislocation Activity Under Nanoscale Contacts Prior to Discontinuous Yield

Original Reports | 更新时间：2026-08-19

- Dislocation Activity Under Nanoscale Contacts Prior to Discontinuous Yield
- Materials Research Letters Vol. 3, Issue 1, Pages: 58-64(2015)
- 作者机构：
  
  School of Materials Engineering Purdue University W. Stadium Ave West Lafayette,701
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2014.961663
  CLC：
- Online First：22 September 2014，
  
  Published：2015
- 稿件说明：
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Michael R. Maughan, David F. Bahr. Dislocation Activity Under Nanoscale Contacts Prior to Discontinuous Yield[J]. Materials Research Letters, 2015, 3(1): 58-64.
DOI：

Michael R. Maughan, David F. Bahr. Dislocation Activity Under Nanoscale Contacts Prior to Discontinuous Yield[J]. Materials Research Letters, 2015, 3(1): 58-64. DOI： 10.1080/21663831.2014.961663.

摘要

Abstract

In nanoindentation

when stresses near the theoretical strength are reached

it is commonly assumed that the volume tested is dislocation free. This study examines the case where permanent deformation occurs prior to an apparent yield point. Force-modulated creep and quasi-static (QS) nanoindentation tests were conducted on Co

and Pt. Statistical comparisons show that the percentage of tests displaying creep correlates with the percentage of QS tests displaying plasticity prior to pop-in. This is evident that apparent plastic behavior prior to pop-in is due to dislocation motion

and permanent deformation can and does occur at extremely small indenter displacements before pop-in.

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