Experimental parameters influencing grain refinement and microstructural evolution during high-pressure torsion

被引：708
|
作者：
Zhilyaev, AP [1 ]
Nurislamova, GV
Kim, BK
Baró, MD
Szpunar, JA
Langdon, TG
机构：
[1] Univ Autonoma Barcelona, Grp Fis Mat 2, Dept Fis, Bellaterra 08193, Spain
[2] Univ So Calif, Dept Aerosp Engn, Los Angeles, CA 90089 USA
[3] Univ So Calif, Dept Mech Engn & Mat Sci, Los Angeles, CA 90089 USA
[4] McGill Univ, Dept Met & Mat Engn, Montreal, PQ H3A 2B2, Canada
[5] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia
[6] Russian Acad Sci, Inst Mech, Ufa 450000, Russia
来源：
ACTA MATERIALIA | 2003年 / 51卷 / 03期
关键词：
nickel; high-pressure torsion; hardness testing; transmission electron microscopy; orientation imaging microscopy;
D O I：
10.1016/S1359-6454(02)00466-4
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Pure nickel was selected for a detailed investigation of the experimental parameters influencing grain refinement and microstructural evolution during processing by high-pressure torsion (HPT). Samples were examined after HPT using microhardness measurements, transmission electron microscopy and orientation imaging microscopy. Processing by HPT produces a grain size of similar to170 nm in pure Ni, and homogeneous and equiaxed microstructures are attained throughout the samples when they are subjected to at least similar to5 whole revolutions under applied pressures of at least similar to6 GPa. For these conditions, the distributions of grain boundary misorientations are similar in the center and at the periphery of the samples. A simple model is proposed to explain the development of a homogeneous microstructure in HPT. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：753 / 765
页数：13
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