A uni-axial Nano-displacement micro-tensile test of individual constituents from bulk material

C. Du, J.P.M. Hoefnagels, L.I.J.C. Bergers, M.G.D. Geers

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)
146 Downloads (Pure)

Abstract

For both single-phase and multiphase metallic materials, it is necessary to understand the mechanical behavior on the grain-size scale in detail to get information that is not obtainable from macro-scale mechanical characterizations. This paper presents a methodology for uniaxial tensile testing of micro-specimens isolated from a bulk material. The proposed concept of multiple parallel micro-tensile specimens at the tip of a macro-sized wedge reduces the alignment work and offers an easy way for specimen handling. The selection of site-specific specimens is based on detailed microstructural and crystallographic characterization. Three kinds of representative specimens are presented to illustrate the wide range of application of the methodology for a variety of materials. Accurate, reproducible measurement of force (2.5 μN resolution) and displacement (~10 nm resolution) is demonstrated, while accurate alignment (in-plane rotational and out-of-plane tilt misalignment of <0.2°) limits the stress due to bending to <0.2% of the imposed uni-axial stress. Combined with detailed material characterization on both sides of the micro-specimens, this method yields detailed insights into the micro-mechanics of bulk materials which is hard to obtain from traditional macro-mechanical tests.

Original languageEnglish
Pages (from-to)1249-1263
Number of pages15
JournalExperimental Mechanics
Volume57
Issue number8
DOIs
Publication statusPublished - 1 Oct 2017

Keywords

  • Crystal orientation mapping
  • In-situ microscopy
  • Micro-tensile test
  • Single-constituent testing
  • Site-specific specimen preparation

Fingerprint

Dive into the research topics of 'A uni-axial Nano-displacement micro-tensile test of individual constituents from bulk material'. Together they form a unique fingerprint.

Cite this