金属/氢共晶定向凝固制备GASAR多孔Cu-Cr合金

Fabrication of GASAR porous Cu-Cr alloy with metal/hydrogen eutectics directional solidification

在0.6 MPa的纯氢气氛中,采用金属/氢共晶定向凝固技术,制备得到不同Cr含量的GASAR多孔Cu-xCr合金试样(x=0,0.3%,0.5%,0.8%,1.0%,1.3%(质量分数,%)),并研究了Cr含量对多孔Cu-xCr合金气孔率和气孔平均直径的影响规律。结果表明:随Cr含量的逐渐增大,氢在合金熔体中的溶解度相应增加,导致多孔Cu-xCr合金试样的气孔率缓慢增高;此外,随Cr含量的增加,受糊状区宽度变化的影响,气孔的平均直径呈先增大后减小的趋势。

GASAR porous Cu-xCr （x=0, 0.3%, 0.5%, 0.8%, 1.0%, 1.3% （mass fraction）） alloys were fabricated by the metal/hydrogen unidirectional solidification method under a hydrogen gas pressure of 0.6 MPa. The effect of the chromium content on the pore structure was investigated. The results show that the difference of hydrogen solubility between liquid and solid contributes to the increase of porosity with increasing Cr content. With increasing Cr content, the average pore diameter tends to firstly increase, and then decrease.