Shear deformation with imposed hydrostatic pressure for enhanced compaction of powder

被引：50
作者：
Lapovok, R. [1 ]
Tomus, D. [1 ]
Bettles, C. [1 ]
机构：
[1] Monash Univ, Dept Mat Engn, ARC Ctr Excellence Design Light Met, Clayton, Vic 3800, Australia
来源：
SCRIPTA MATERIALIA | 2008年 / 58卷 / 10期
关键词：
Ti-6Al-4V powder compaction; equal channel angular extrusion; back pressure; pores; density;
D O I：
10.1016/j.scriptamat.2008.01.010
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this paper equal channel angular extrusion with back pressure was used to compact Ti-6Al-4V powder at 400 degrees C, achieving relative densities of 98.3-98.6% and green strengths up to 750 MPa. The novelty of the approach arises from the notion that severe shear deformation is an important factor for consolidation. Improved compaction is related to enhanced self-diffusion through the creation of additional diffusion paths (defects) and the imposed hydrostatic pressure. The role of deformation mechanisms in improving compaction is discussed. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：898 / 901
页数：4
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