Jian CHEN
,
Wenduo WEI
,
Mingchuan YANG
,
Xiukui SUN
,
Wenxiu CHEN and Zhuangqi HU (State Key Lab. of RSA
,
Institute of Metal Research
,
Chinese Academy Sciences
,
Shenyang
,
110015
,
China)
材料科学技术（英）
The composition distribution in Fe50Pd50 alloy ultrafine particles prepared by inert gas condensation method was investigated in details by means of X-ray diffraction technique through deconvolution of the X-ray diffraction data. The microscopic composition distribution in the alloy UFP was identified, which is caused by nonuniformity of the melt, fractional distillation during the evaporation process and statistical fluctuation during nucleation and coalescence of the alloy particles. The composition distribution affects the properties of the alloy UFP
关键词:
Xiaoying CHENG
,
Xiaojing WAN
,
Qiuyun WU
,
Xiukui SUN
材料科学技术（英）
The diffusivity of hydrogen in two Ni3Al alloys (No.1 and No.2) has been measured in the temperature range of 100℃ to 420℃ using an ultrahigh vacuum gaseous permeation technique. The diffusivity data fall into two segments, in which the hydrogen diffusivity adheres to the Arrhenius form, respectively. From the hydrogen diffusivity, it is conjectured that the hydrogen diffusivity reflects the hydrogen transportation along the grain boundaries at lower temperature and the hydrogen transportation in the lattice at higher temperature. The intergranular fracture of Lit-type intermetallics induced by hydrogen at relative low temperature results from hydrogen transportation along the grain boundaries and not in the lattice.
关键词:
