An in situ synchrotron X-ray diffraction study of precipitation kinetics in a severely deformed Cu-Ni-Si alloy

被引：44

作者：

Azzeddine, H. ^{[1
]}

Mehdi, B. ^{[1
]}

Hennet, L. ^{[2
]}

Thiaudiere, D. ^{[3
]}

Alili, B. ^{[1
]}

Kawasaki, M. ^{[4
,5
,6
]}

Bradai, D. ^{[1
]}

Langdon, T. G. ^{[5
,6
,7
]}

机构：

[1] USTHB, Fac Phys, Algiers, Algeria

[2] CNRS CEMHTI, F-45071 Orleans 2, France

[3] Synchrotron SOLEIL, F-91192 Gif Sur Yvette, France

[4] Hanyang Univ, Div Mat Sci & Engn, Seoul 133791, South Korea

[5] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA

[6] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA

[7] Univ Southampton, Mat Res Grp, Fac Engn & Environm, Southampton SO17 1BJ, Hants, England

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 597卷

基金：

美国国家科学基金会; 欧洲研究理事会;

关键词：

Cu-Ni-Si alloy; ECAP; HPT; Precipitation; Synchrotron X-ray diffraction; Ultrafine-grained metals; SEVERE PLASTIC-DEFORMATION; HIGH-PRESSURE TORSION; AL-ZN; MECHANICAL-PROPERTIES; PHASE-TRANSFORMATION; MICROSTRUCTURE; EVOLUTION; STRENGTH; BEHAVIOR; DIFFUSION;

D O I：

10.1016/j.msea.2013.12.092

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In situ synchrotron X-ray diffraction was used to study the decomposition kinetics of a metastable Cu-2.5Ni-0.6Si (wt%) alloy after severe plastic deformation by equal-channel angular pressing (ECAP) and high-pressure torsion (HPT). The measurements were performed at room temperature and also at high temperatures of 723, 823 and 973 K in order to determine the ageing effect after processing. Two forms of precipitates, namely delta-Ni2Si and gamma-Ni5Si2, were identified and the sequence of their appearance was well established for ECAP processing and ageing. There was no detection of either a modulated structure resulting from spinodal decomposition or an ordered structure nucleated from the modulated structure. An X-ray hybrid pixel array detector (XPAD-S140 detector) permitted the detection of the nucleation stages of the (delta-Ni2Si phase that began soon after 24 s of ageing at 723 K. There was also no trace of any amorphization of the matrix phase. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：288 / 294

页数：7

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