Characterisation and modelling of micro- and macroscale creep and strain rate sensitivity in Zircaloy-4

被引：11

作者：

Liu, Yang ^{[1
]}

Wan, Weifeng ^{[1
]}

Dunne, Fionn P. E. ^{[1
]}

机构：

[1] Imperial Coll London, Dept Mat, London SW7 2AZ, England

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2022年 / 840卷

基金：

英国工程与自然科学研究理事会;

关键词：

Crystal Plasticity; Creep; Zirconium alloy; Micromechanics; Finite element analysis; THERMALLY ACTIVATED DEFORMATION; CRYSTAL-PLASTICITY; FATIGUE; SLIP; HCP; BEHAVIOR; METALS; PHASE;

D O I：

10.1016/j.msea.2022.142981

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Intrinsic crystal slip system properties which control stress, stress relaxation and strain rate sensitivity (SRS) are investigated using combined experimental bend testing, digital image correlation strain measurement and electron backscatter detection with crystal plasticity modelling. Intrinsic properties (activation energy and volume) have been determined from room temperature experiments on Zircaloy-4 which has been shown to creep at 20 degrees C with non-negligible SRS of -0.03. Polycrystal plasticity modelling has been shown to capture DIC-measured intra-and transgranular creep strain and SRS evolution, and intragranular stresses have been calculated and shown to quantitatively reproduce those estimated from differential DIC strain measurements. The modelling also reproduces polycrystal sample-measured stress, stress relaxation and SRS behaviour remarkably well demonstrating consistency from slip system properties to polycrystal strain rate sensitivity. Polycrystal plasticity finally predicts diffraction-measured effects of texture and slip system activation on lattice strain rate sensitivities.

引用

页数：18

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