Equal channel angular pressing of metal matrix composites: Effect on particle distribution and fracture toughness

被引：150
|
作者：
Sabirov, I
Kolednik, O
Valiev, RZ
Pippan, R
机构：
[1] Austrian Acad Sci, Erich Schmid Inst Mat Sci, A-8700 Leoben, Austria
[2] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa, Russia
来源：
ACTA MATERIALIA | 2005年 / 53卷 / 18期
基金：
奥地利科学基金会;
关键词：
metal matrix composites; powder metallurgy; equal channel angular pressing; particle distribution; fracture toughness;
D O I：
10.1016/j.actamat.2005.07.010
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An A16061-20%Al2O3 powder metallurgy (PM) metal matrix composite (MMC) with a strongly clustered particle distribution is subjected to equal channel angular pressing (ECAP) at a temperature of 370 degrees C. The evolution of the homogeneity of the particle distribution in the material during ECAP is investigated by the quadrat method. The model proposed by Tan and Zhang [Mater Sci Eng 1998;244:80] for estimating the critical particle size which is required for a homogeneous particle distribution in PM MMCs is extended to the case of a combination of extrusion and ECAP. The applicability of the model to predict a homogeneity of the particle distribution after extrusion and ECAP is discussed. It is shown that ECAP leads to an increase of the uniformity of the particle distribution and the fracture toughness. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：4919 / 4930
页数：12
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