High-pressure torsion for enhanced atomic diffusion and promoting solid-state reactions in the aluminum-copper system

被引：168
作者：
Oh-ishi, Keiichiro [1 ]
Edalati, Kaveh [2 ,3 ]
Kim, Hyoung Seop [4 ]
Hono, Kazuhiro [1 ]
Horita, Zenji [2 ,3 ]
机构：
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
[2] Kyushu Univ, Fac Engn, Dept Mat Sci & Engn, Fukuoka 8190395, Japan
[3] Kyushu Univ, WPI, Int Inst Carbon Neutral Energy Res WPI I2CNER, Fukuoka 8190395, Japan
[4] Pohang Univ Sci & Technol, Dept Mat Sci & Engn, Pohang 790784, South Korea
来源：
ACTA MATERIALIA | 2013年 / 61卷 / 09期
关键词：
Severe plastic deformation (SPD); Intermetallics; Ultrafine grains; Diffusion coefficient; Phase transformation; SEVERE PLASTIC-DEFORMATION; AL-MG ALLOYS; MECHANICAL-PROPERTIES; THERMAL-STABILITY; PURE CU; MICROSTRUCTURES; NANOCOMPOSITES; INTERMETALLICS; CONSOLIDATION; FABRICATION;
D O I：
10.1016/j.actamat.2013.02.042
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study reports that solid-state reactions occur by the application of high-pressure torsion (HPT) to the Al-Cu system even at low homologous temperature. A bulk form of disc consisting of two separate half-discs of pure Al and pure Cu are processed by HPT at ambient temperature under a pressure of 6 GPa. X-ray diffraction analysis and high-resolution transmission electron microscopy confirm the formation of different intermetallic phases such as Al2Cu, AlCu and Al4Cu9, as well as the dissolution and supersaturation of Al and Cu in each matrix. It is shown that the diffusion coefficient is enhanced by 10(12)-10(22) times during the HPT processing in comparison with the lattice diffusion and becomes comparable to the surface diffusion. The enhanced diffusion is attributed to the presence of a high density of lattice defects such as vacancies, dislocations and grain boundaries produced by HPT processing. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：3482 / 3489
页数：8
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