TY - JOUR
T1 - A uni-axial Nano-displacement micro-tensile test of individual constituents from bulk material
AU - Du, C.
AU - Hoefnagels, J.P.M.
AU - Bergers, L.I.J.C.
AU - Geers, M.G.D.
PY - 2017/10/1
Y1 - 2017/10/1
N2 - 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.
AB - 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.
KW - Crystal orientation mapping
KW - In-situ microscopy
KW - Micro-tensile test
KW - Single-constituent testing
KW - Site-specific specimen preparation
UR - http://www.scopus.com/inward/record.url?scp=85020717209&partnerID=8YFLogxK
U2 - 10.1007/s11340-017-0299-6
DO - 10.1007/s11340-017-0299-6
M3 - Article
AN - SCOPUS:85020717209
SN - 0014-4851
VL - 57
SP - 1249
EP - 1263
JO - Experimental Mechanics
JF - Experimental Mechanics
IS - 8
ER -