HIGH-STRAIN-RATE SUPERPLASTICITY IN ALUMINUM MATRIX COMPOSITES

被引:97
作者
NIEH, TG
WADSWORTH, J
机构
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1991年 / 147卷 / 02期
关键词
D O I
10.1016/0921-5093(91)90839-F
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Superplasticity has been observed in several whisker-reinforced aluminum composites at extremely high strain rates of approximately 0.1-1 s-1. These composites include beta-SiC-2124Al, beta-Si3N4-2124Al, alpha-Si3N4-7064Al and beta-Si3N4-6061Al. The materials generally exhibited a strain rate sensitivity value of about 0.3 and a maximum elongation of about 300%. The exact deformation mechanism leading to superplasticity is apparently a unique one. Experimental results indicated that the ability of a whisker-reinforced composite to undergo high-strain-rate superplasticity depends upon the morphology, crystal structure and chemistry of the whiskers, as well as on the chemical composition at the whisker-matrix interfaces. It is proposed that the presence of a low melting point region, or in some cases a liquid phase, at the whisker-matrix interfaces is responsible for the observed phenomenon of superplasticity at very high rates. These regions are present at the deformation temperature as a result of solute segregation. It is noted that the phenomenon is not observed in all whisker-reinforced composites despite the fact that they contain fine grain sizes. Thus a fine matrix grain size is a necessary but insufficient condition for the observation of high-strain-rate superplasticity in whisker-reinforced composites.
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页码:129 / 142
页数:14
相关论文
共 37 条
[1]  
[Anonymous], 1986, BINARY ALLOY PHASE D
[2]   THE ROLE OF ADIABATIC HEATING ON HIGH-RATE SUPERPLASTIC ELONGATION [J].
BIELER, TR ;
MUKHERJEE, AK .
SCRIPTA METALLURGICA ET MATERIALIA, 1990, 24 (06) :1003-1008
[3]   SUPERPLASTIC-LIKE BEHAVIOR AT HIGH-STRAIN RATES IN MECHANICALLY ALLOYED ALUMINUM [J].
BIELER, TR ;
NIEH, TG ;
WADSWORTH, J ;
MUKHERJEE, AK .
SCRIPTA METALLURGICA, 1988, 22 (01) :81-86
[4]   THE HIGH-STRAIN RATE SUPERPLASTIC DEFORMATION MECHANISMS OF MECHANICALLY ALLOYED ALUMINUM-IN90211 [J].
BIELER, TR ;
MUKHERJEE, AK .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1990, 128 (02) :171-182
[5]   MICROSTRUCTURAL DEVELOPMENT IN AN ALUMINUM ALLOY-SIC WHISKER COMPOSITE [J].
CHRISTMAN, T ;
SURESH, S .
ACTA METALLURGICA, 1988, 36 (07) :1691-1704
[6]  
FURUSHIRO N, 1990, P MAT RES S, V196, P249
[7]   INFLUENCE OF ANISOTROPIC DISTRIBUTION OF WHISKERS ON THE SUPERPLASTIC BEHAVIOR OF ALUMINUM IN A BACK-EXTRUDED 6061 AL-20-PERCENT SICW COMPOSITE [J].
GONZALEZDONCEL, G ;
KARMARKAR, SD ;
DIVECHA, AP ;
SHERBY, OD .
COMPOSITES SCIENCE AND TECHNOLOGY, 1989, 35 (02) :105-120
[8]   HIGH-TEMPERATURE DEFORMATION OF ULTRA-FINE-GRAINED OXIDE DISPERSION STRENGTHENED ALLOYS [J].
GREGORY, JK ;
GIBELING, JC ;
NIX, WD .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1985, 16 (05) :777-787
[9]   SUPERPLASTICITY IN beta-SILICON NITRIDE WHISKER-REINFORCED 2124 ALUMINIUM COMPOSITE [J].
IMAI, T ;
MABUCHI, M ;
TOZAWA, Y ;
YAMADA, M .
JOURNAL OF MATERIALS SCIENCE LETTERS, 1990, 9 (03) :255-257
[10]  
IMAI T, 1990, METAL & CERAMIC MATRIX COMPOSITES : PROCESSING MODELING & MECHANICAL BEHAVIOR, P235