BCC-FCC interfacial effects on plasticity and strengthening mechanisms in high entropy alloys

被引：145

作者：

Basu, Indranil ^{[1
]}

Ocelik, Vaclav ^{[1
]}

De Hosson, Jeff ThM. ^{[1
]}

机构：

[1] Univ Groningen, Zernike Inst Adv Mat, Mat Innovat Inst, Dept Appl Phys, NL-9747 AG Groningen, Netherlands

来源：

ACTA MATERIALIA | 2018年 / 157卷

关键词：

Nanoindentation; Electron back scatter diffraction; Residual stress; Dislocations; Interphase boundary; ATOMISTIC SIMULATIONS; GRAIN-BOUNDARIES; DEFORMATION MECHANISMS; STRESS GRADIENTS; DISLOCATIONS; MODEL; NANOINDENTATION; DESIGN;

D O I：

10.1016/j.actamat.2018.07.031

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Al0.7CoCrFeNi high entropy alloy (HEA) with a microstructure comprising strain free face-centered cubic (FCC) grains and strongly deformed sub-structured body centered cubic (BCC) grains was subjected to correlative nanoindentation testing, orientation imaging microscopy and local residual stress analysis. Depending on the geometry of BCC-FCC interface, certain boundaries indicated appearance of additional yield excursions apart from the typically observed elastic to plastic displacement burst. The role of interfacial strengthening mechanisms is quantified for small scale deformation across BCC-FCC inter phase boundaries. An overall interfacial strengthening of the order of 4 GPa was estimated for BCC-FCC interfaces in HEAs. The influence of image forces due to the presence of a BCC-FCC interface is quantified and correlated to the observed local stress and hardness gradients in both the BCC and FCC grains. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：83 / 95

页数：13

共 47 条

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