A SUPERPLASTIC COVALENT CRYSTAL COMPOSITE

被引:321
作者
WAKAI, F
KODAMA, Y
SAKAGUCHI, S
MURAYAMA, N
IZAKI, K
NIIHARA, K
机构
[1] MISTUBISHI GAS CHEM CO LTD,TAYUHAMA,NIIGATA 95031,JAPAN
[2] OSAKA UNIV,INST SCI & IND RES,IBARAKI,OSAKA 567,JAPAN
关键词
D O I
10.1038/344421a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Superplasticity is defined phenomenologically as the ability of a material to exhibit exceptionally large elongations during tensile deformation1. It is a property of some poly crystalline solids, and is well established for metals and alloys2. Superplasticity has also been observed in some ionic crystals, such as Y2O3-stabilized tetragonal ZrO2 polycrystals3,4, but has not been found previously for covalent crystals. Here we report superplastic elongation (by more than 150%) of a covalent crystal composite, Si3N4/SiC. The superplasticity is probably related to the presence of an inter-granular liquid phase. Combined with its hardness, this property suggests several useful applications for the novel material: for example, to form engine components - superplasticity will make it readily mouldable at high temperatures. © 1990 Nature Publishing Group.
引用
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页码:421 / 423
页数:3
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