THE ROLE OF MICROSTRUCTURE ON STRENGTH AND DUCTILITY OF HOT-EXTRUDED MECHANICALLY ALLOYED NIAL

被引:48
作者
DOLLAR, M
DYMEK, S
HWANG, SJ
NASH, P
机构
[1] UNIV TSUKUBA,INST MAT SCI,TSUKUBA,JAPAN
[2] STANISLAW STASZIC UNIV MIN & MET,DEPT MET,PL-30059 KRAKOW,POLAND
来源
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1993年 / 24卷 / 09期
关键词
D O I
10.1007/BF02666334
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Mechanical alloying followed by hot extrusion has been used to produce very fine-grained NiAl-based alloys containing oxide dispersoids. The dispersoids affect the progress of recrystallization during hot extrusion and contribute to the preservation of the [110] deformation fiber texture. The [110] texture enables the activation of {110} (100) and {110} [110] slip systems. The occurrence of [100] and [110] slip dislocations satisfies the von Mises criterion for general plasticity and is postulated to contribute to notable room-temperature compressive ductility of the mechanically alloyed (MA) materials. Another factor likely affecting the compressive ductility is the predominant occurrence of low-angle grain boundaries. The attractive dislocation-dispersoid interactions lead to a ductility trough observed at 800 K in the MA materials. The MA NiAl materials are strong at both ambient and elevated temperatures due to fine grain and the presence of dispersoids and interstitial atoms.
引用
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页码:1993 / 2000
页数:8
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