F.Yan
,
K.Wu
,
M.Zhao
金属学报(英文版)
The superplastic deformation behavior of SiCw/ZK60 composite was investigated at temperatures ranging from 573K to 723K and at initial strain rates ranging from 8.3× 10^-4s^-1 to 8.3×10^-2s^-1.A maximum elongation of 200 138325116th a m-value of 0.35 was obtained at 613K and a initial strain rate of 1.67×10^-2s^-1.The apparent activation energy(98kJ/mol)approximates that for grain boundary diffusion(92kJ/mol)in magnesium.It is proposed that the dominant mechanism of superplastic deformation in the present composite is grain boundary sliding accommodated by diffusional transport,besides,interfacial sliding plays an important role in the superplastic deformation.
关键词:
magnesium matrix composite
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