Plastic instabilities with propagating deformation bands in Cu-Al alloys

被引：12
|
作者：
Klose, FB
Weidenmüller, J
Ziegenbein, A
Hähner, P
Neuhäuser, H
机构：
[1] Tech Univ Carolo Wilhelmina Braunschweig, Inst Met Phys & Nukl Festkorperphys, D-38106 Braunschweig, Germany
[2] Commiss European Communities, Joint Res Ctr, Inst Energy, NL-1755 ZG Petten, Netherlands
来源：
PHILOSOPHICAL MAGAZINE | 2004年 / 84卷 / 3-5期
关键词：
D O I：
10.1080/14786430310001610320
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A multizone laser scanning extensometric technique is used to measure, in parallel with sensitive and rapid stress recording, the sudden strain avalanches and accompanying stress drops during the Portevin Le Chdtelier (PLC) plastic instabilities of type B, which are characterized by jerky propagation in successive short jumps of a deformation band along the specimen axis during deformation with constant strain rate. For the example of Cu-15 at% Al polycrystals the breakaway process for the plastic avalanches is analysed from their strain rate and temperature dependence. It is concluded that local stress concentrations are essential in addition to the dynamic-strain-ageing effect in producing the PLC effect.
引用
收藏
页码：467 / 480
页数：14
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