Unusual annealing effects on hardness and strain rate sensitivity of nanocrystalline Nb

被引：8

作者：

Zhao, J. ^{[1
]}

Huang, P. ^{[2
]}

Xu, K. W. ^{[2
]}

Wang, F. ^{[1
]}

Lu, T. J. ^{[1
,3
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Aerosp, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Peoples R China

[2] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[3] Xi An Jiao Tong Univ, MOE Key Lab Multifunct Mat & Struct, Xian 710049, Peoples R China

来源：

THIN SOLID FILMS | 2018年 / 645卷

基金：

中国国家自然科学基金;

关键词：

Hardness; Nanoindentation; Body-centered cubic; Annealing; MECHANICAL-BEHAVIOR; BCC METALS; DISLOCATION MULTIPLICATION; ACTIVATION VOLUME; GRAIN-BOUNDARIES; ULTRAFINE GRAIN; TEMPERATURE; PLASTICITY; NI; MICROPILLARS;

D O I：

10.1016/j.tsf.2017.10.023

中图分类号：

T [工业技术];

学科分类号：

120111 [工业工程];

摘要：

The dependence of microstructure, hardness (H) and strain rate sensitivity (m) of nanocrystalline (NC) body-centered cubic Nb thin films at various annealed temperature were experimentally evaluated. The annealed temperatures ranged from 100 to 400 degrees C, and kept for 30 min respectively. Despite nearly unchanged grain sizes upon annealing, the strengthening effect was observed in nanoindentation hardness testing as annealing temperature was increased above 200 degrees C. In particular, the strain rate sensitivity of NC Nb increased significantly after annealing at 100 degrees C and slightly decreased at higher annealing temperatures. Competitive mechanisms underlying the different variation trends of hardness and strain rate sensitivity of NC Nb annealed in the two different temperature regimes were proposed.

引用

页码：146 / 153

页数：8

共 39 条

[1]

A crossover from hardening to softening in nanocrystalline Ni by annealing and rolling [J].