Creep behavior in an Al-Fe-V-Si alloy and SiC whisker-reinforced Al-Fe-V-Si composite

IMR OpenIR

	Creep behavior in an Al-Fe-V-Si alloy and SiC whisker-reinforced Al-Fe-V-Si composite; Creep behavior in an Al-Fe-V-Si alloy and SiC whisker-reinforced Al-Fe-V-Si composite
	L. M. Peng; S. J. Zhu; F. G. Wang; H. R. Chen; Z. Y. Ma; J. Bi
	1998 ; 1998
发表期刊	Journal of Materials Science ; Journal of Materials Science
ISSN	0022-2461 ; 0022-2461
卷号	33 期号:23 页码:5643-5652
摘要	High temperature strengthening mechanisms in discontinuous metal matrix composites were examined by performing a close comparison between the creep behavior of 15 vol. pet SiCw/8009Al and that of its matrix alloy, 8009Al. Both the alloy and composite exhibit a single-slope behavior with anomalously high values of apparent stress exponent and high apparent activation energy. The presence of SiC whiskers does not remarkably influence these two kinds of dependence of creep rates but reduces the creep rates by about two orders of magnitude. Transmission electron microscopy examination of the deformation microstructure reveals the occurrence of attractive dislocation/particle interaction. The creep data were analyzed by the threshold stress approach and by the dislocation-climb theories based on attractive interaction between dislocations and dispersoids. All data can be rationalized by a power-law with a stress exponent of 5 and a creep activation energy close to that for the self-diffusion in aluminum. The threshold stress decreases linearly with increasing temperature. General climb together with the attractive but not strong interactions between the dislocations and dispersoids is suggested to be the operative deformation mechanism. The contribution of SIC whiskers to the creep strength of 8009 Al composite can be evaluated quantitatively when the shear-lag model is applied. However, the effects of whisker length and whisker orientation distributions must be considered. Two probability density functions are used for modelling the distribution of whisker length and whisker orientation. (C) 1998 Kluwer Academic Publishers.; High temperature strengthening mechanisms in discontinuous metal matrix composites were examined by performing a close comparison between the creep behavior of 15 vol. pet SiCw/8009Al and that of its matrix alloy, 8009Al. Both the alloy and composite exhibit a single-slope behavior with anomalously high values of apparent stress exponent and high apparent activation energy. The presence of SiC whiskers does not remarkably influence these two kinds of dependence of creep rates but reduces the creep rates by about two orders of magnitude. Transmission electron microscopy examination of the deformation microstructure reveals the occurrence of attractive dislocation/particle interaction. The creep data were analyzed by the threshold stress approach and by the dislocation-climb theories based on attractive interaction between dislocations and dispersoids. All data can be rationalized by a power-law with a stress exponent of 5 and a creep activation energy close to that for the self-diffusion in aluminum. The threshold stress decreases linearly with increasing temperature. General climb together with the attractive but not strong interactions between the dislocations and dispersoids is suggested to be the operative deformation mechanism. The contribution of SIC whiskers to the creep strength of 8009 Al composite can be evaluated quantitatively when the shear-lag model is applied. However, the effects of whisker length and whisker orientation distributions must be considered. Two probability density functions are used for modelling the distribution of whisker length and whisker orientation. (C) 1998 Kluwer Academic Publishers.
部门归属	dalian univ technol, dept mat engn, dalian 116023, peoples r china. chinese acad sci, inst met res, shenyang 110015, peoples r china.;zhu, sj (reprint author), dalian univ technol, dept mat engn, dalian 116023, peoples r china;zhu@mce.uec.ac.jp ; dalian univ technol, dept mat engn, dalian 116023, peoples r china. chinese acad sci, inst met res, shenyang 110015, peoples r china.;zhu, sj (reprint author), dalian univ technol, dept mat engn, dalian 116023, peoples r china;zhu@mce.uec.ac.jp
关键词	High-temperature Creep High-temperature Creep Mechanical-properties Mechanical-properties Deformation-behavior Deformation-behavior Steady-state Steady-state Elevated-temperature Elevated-temperature Dislocation Climb Dislocation Climb Matrix Matrix Composites Composites Powder-metallurgy Powder-metallurgy Ti Alloy Ti Alloy Aluminum Aluminum
URL	查看原文 ; 查看原文
WOS记录号	WOS:000078834200019 ; WOS:000078834200019
引用统计	被引频次：20[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37749
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. M. Peng,S. J. Zhu,F. G. Wang,et al. Creep behavior in an Al-Fe-V-Si alloy and SiC whisker-reinforced Al-Fe-V-Si composite, Creep behavior in an Al-Fe-V-Si alloy and SiC whisker-reinforced Al-Fe-V-Si composite[J]. Journal of Materials Science, Journal of Materials Science,1998, 1998,33, 33(23):5643-5652, 5643-5652.
APA	L. M. Peng,S. J. Zhu,F. G. Wang,H. R. Chen,Z. Y. Ma,&J. Bi.(1998).Creep behavior in an Al-Fe-V-Si alloy and SiC whisker-reinforced Al-Fe-V-Si composite.Journal of Materials Science,33(23),5643-5652.
MLA	L. M. Peng,et al."Creep behavior in an Al-Fe-V-Si alloy and SiC whisker-reinforced Al-Fe-V-Si composite".Journal of Materials Science 33.23(1998):5643-5652.