"In-situ" mechanical characterisation of WC-Co hardmetals using microbeam testing

被引：18

作者：

Trueba, M. ^{[1
]}

Aramburu, A. ^{[1
]}

Rodriguez, N. ^{[1
]}

Iparraguirre, I. ^{[1
]}

Elizalde, M. R. ^{[1
]}

Ocana, I. ^{[1
]}

Sanchez, J. M. ^{[1
]}

Martinez-Esnaola, J. M. ^{[1
]}

机构：

[1] CEIT & TECNUN, Gipuzkoa 20018, Basque Country, Spain

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2014年 / 43卷

关键词：

Hardmetals; Microbeams; Bending strength; Toughness; CRYSTAL PLASTICITY; CRACK-GROWTH; STRENGTH; FRACTURE; DEFORMATION; COMPOSITES; ALLOYS; SIZE;

D O I：

10.1016/j.ijrmhm.2013.12.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microbeam testing is proposed as a new method for analysing the mechanical properties of individual microstructural features in WC-Co hardmetals; i.e. portions of WC grains or a single metallic ligament. Firstly, cantilever microbeams with dimensions below the microstructural scale of the material are machined by means of a focused ion beam (FIB). Afterwards, these beams are bended to fracture by means of an instrumented nanoindenter. In this way, both portions of WC grains and binder phase ligaments are broken while simultaneously recording the load and the vertical displacement of the nanoindenter tip. These cracking events are detected as sudden steps in the load vs. displacement curves. Afterwards, a scanning electron microscope is used to measure the distance from the main crack to the beam clamping. From these data, the stresses at which portions of cobalt ligaments and WC grains fail are estimated from linear elastic theory and FEM models. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：236 / 240

页数：5

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