(1. 昆明理工大学 材料科学与工程学院，昆明 650093；
2. 昆明冶金高等专科学校 冶金材料学院，昆明 650093)
摘 要: 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。
关键字: Cu-Cr合金；多孔金属；金属/氢共晶定向凝固；气孔率；糊状区
（1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology,
Kunming 650093, China;
2. Faculty of Metallurgy and Materials, Kunming College of Metallurgy, Kunming 650093, China）
Abstract: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.
Key words: Cu-Cr alloy; porous metal; metal/hydrogen eutectics directional solidification; porosity; mushy zone
