THE PORTEVIN-LE CHATELIER EFFECT IN CU-AL SINGLE-CRYSTALS INVESTIGATED BY ACOUSTIC-EMISSION AND SLIP LINE CINEMATOGRAPHY

被引：9

作者：

CHMELIK, F ^{[1
]}

DOSOUDIL, J ^{[1
]}

PLESSING, J ^{[1
]}

NEUHAUSER, H ^{[1
]}

LUKAC, P ^{[1
]}

TROJANOVA, Z ^{[1
]}

机构：

[1] TECH UNIV CAROLO WILHELMINA BRAUNSCHWEIG,INST MET PHYS & NUCL SOLID STATE PHYS,D-38106 BRAUNSCHWEIG,GERMANY

来源：

PLASTICITY OF METALS AND ALLOYS - ISPMA 6 | 1994年 / 97-9卷

关键词：

PORTEVIN LE CHATELIER EFFECT; ACOUSTIC EMISSION; SLIP LINE CINEMATOGRAPHY;

D O I：

10.4028/www.scientific.net/KEM.97-98.263

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Stage I of plastic deformation of Cu-Al single crystals has been studied within the temperature range 296-788K by the acoustic emission and slip line cinematography methods. Inhomogeneous deformation of the Luders type was observed. From 470K up to 720K the deformation is characterized by the Portevin-Le Chatelier (PLC) effect (serrated flow). The number of simultaneously active slip band bundles decreases with increasing temperature and in the PLC regime only one dip band bundle is active during each serration. No slip band bundles were observed at temperatures higher than that for the PLC effect termination. The onset of the PLC regime is manifested by a step arise behaviour of acoustic emission (AE) and an increase of AE continuous and burst count rates by several orders. Increasing the temperature within the range of the PLC regime results in a remarkable increase of the height of serrations, the rate of occurring slip lines and the AE count rates. The high temperature termination of the PLC effect is characterized by a significant decay in count rates.

引用

页码：263 / 268

页数：6

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