宋群玲,金青林,李再久,杨天武,蒋业华,周荣

• 1:昆明理工大学材料科学与工程学院
• 2:昆明冶金高等专科学校冶金材料学院

摘要(Abstract)：

在0.6 MPa纯H2气氛中,采用金属/H2共晶定向凝固(Gasar)技术制备得到Gasar多孔Cu-x Cr合金。研究了Cr含量、凝固模式以及凝固速率对Gasar多孔合金气孔结构和显微组织的影响。结果表明,当合金以平面、胞状及柱状枝晶凝固时,Gasar多孔Cu-x Cr合金能获得定向生长气孔。当凝固方式转变为等轴枝晶凝固时,定向生长气孔发生中断。Gasar多孔Cu-x Cr合金(x=0.8%、1.3%)气孔在共晶相前沿析出,与共晶组织协同定向生长。随Cr含量增加,共晶组织体积百分比增加,孔隙率和孔圆整度进一步增加;随多孔Cu-1.3 Cr合金试样凝固高度增加,凝固速率下降,界面生长方式转变为等轴晶生长方式,则无法得到定向生长气孔。

关键词(KeyWords)： Gasar;多孔Cu-Cr合金;凝固速率;共晶组织;凝固模式

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51164018);; 云南省教育厅基金(2012Y337)

作者(Author): 宋群玲,金青林,李再久,杨天武,蒋业华,周荣

DOI: 10.13289/j.issn.1009-6264.2015.03.003

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