(1. 昆明理工大學(xué) 材料科學(xué)與工程學(xué)院，昆明 650093；
2. 昆明冶金高等專(zhuān)科學(xué)校 冶金材料學(xué)院，昆明 650093)
摘 要: 在0.6 MPa的純氫氣氛中，采用金屬/氫共晶定向凝固技術(shù)，制備得到不同Cr含量的GASAR多孔Cu-xCr合金試樣(x=0, 0.3%, 0.5%, 0.8%, 1.0%, 1.3%(質(zhì)量分?jǐn)?shù)，%))，并研究了Cr含量對(duì)多孔Cu-xCr 合金氣孔率和氣孔平均直徑的影響規(guī)律。結(jié)果表明：隨Cr含量的逐漸增大，氫在合金熔體中的溶解度相應(yīng)增加，導(dǎo)致多孔 Cu-xCr合金試樣的氣孔率緩慢增高；此外，隨Cr含量的增加，受糊狀區(qū)寬度變化的影響，氣孔的平均直徑呈先增大后減小的趨勢(shì)。
關(guān)鍵字: Cu-Cr合金；多孔金屬；金屬/氫共晶定向凝固；氣孔率；糊狀區(qū)
（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
