T. Imai
,
L. Geng
,
J. F. Mao and I. Tochigi 1) National Industrial Research Institute of Nagoya
,
1-1 Hirate-cho
,
Kita-ku
,
Nagoya
,
462-8510
,
Japan 2) School of Materials Science & Engineering
,
Harbin Institute of Technology
,
Harbin 15001
,
China 3) Kanagawa High-Technology Foundation
,
Kanagawa Science Park
,
3-2-1
,
Sakado
,
Takatsu-ku
,
Kawasaki
,
Kanagawa 213
,
Japan
金属学报(英文版)
β-Si3N4 whisker reinforced aluminum composites was fabricated by squeeze casting before extrusion and an effect of content of Mg on the High Strain Rate Superplastic- ity (HSRS) were investigated, The optimum temperature of the composites at which maximum total elongation is obtained decreases according to magnesium content and the β-Si_3N_4w/Al-3Mg exhibits the total elongation of about 200% at the strain rate of 10~(-1) s~(-1) and at 853-858 K, although the β-Si_3N_4w/Al-0Mg composite shows about 100% elongation at the strain rate of about 1×10~(-1) s~(-1) at 903-913 K. Optimum strain rate of the composites fabricated by squeeze casting was about 1×10~(-1) s~(-1) but TEM observation indicates that the β-Si_3N_4w/Al-Mg has a fine grain of about 2- 3μm and that the whisker might no react with Mg at the interfaces, although the β-Si_3N_4 whisker react with aluminum matrix.
关键词:
high strain rate superplasticity
,
null
,
null
X.J.Xu
,
D. Zhang
,
Z.L. Shi
,
C.Z.Zhao and R.J. Wu (State Key Laboratory of Metal Matrir Composites
,
Shanghai Jiaotong University
,
Shanghai 200030
,
China)
金属学报(英文版)
In this paper,the superplastic characteristics of the beta-SiC whisker reinforced 2024aluminum composite, fabricated by squeeze casting and hot-rolling after extrusion were investigated. The compsite had a fine grain size of about 2μm, and exhibited a strain rate sensitivity of about 0.35 and a maximum elongation of 350% at an initial strain rate of 1.1×10-1s-1 at 803K. In addition, the superplastic deformation mechanisme of the composite were also examined.
关键词:
high strain rate superplasticity
,
null
,
null
