粉末冶金Ni-Fe-Al合金制备工艺与性能  

Preparative technology and property of powder metallurgy Ni-Fe-Al alloys

作　　者：卢静[1] 罗丰华 陈明军[1] 毛海娜[1] 张皓[1] 

机构地区：[1]中南大学粉末冶金国家重点试验室,湖南长沙410083 [2]莱芜钢铁集团粉末冶金有限公司,山东莱芜271105

出　　处：《金属热处理》2008年第12期24-27,共4页Heat Treatment of Metals

基　　金：中南大学2006年度创新基金(LB06100)

摘　　要：用粉末冶金法制备Ni-Fe-Al合金,将元素Ni、Fe、Al粉混合后在500 MPa的压力下进行压制成形,分别在1280℃和1300℃下进行烧结,对烧结坯进行密度、拉伸力学性能检测、X射线衍射分析、断口及组织观察。结果表明,在1280℃烧结时NiFe18.5Al25合金密度可达6.57 g/cm3(相对密度为94.3%),抗拉强度达到718.7 MPa,说明采用粉末冶金法可制备高性能Ni-Fe-Al合金。烧结Ni-Fe-Al合金中γ相的体积分数随Ni含量增加而增加,相对密度和抗拉强度随Ni含量的增加而提高,说明γ相的增加有利于烧结。对比三种合金,NiFe18.5Al25合金性能最优,主要是由于该合金中γ相体积分数最高。Ni-Fe-Al alloys were made by powder metallurgy from mixing elementary powder Ni, Fe, Al. The alloys were sintered at 1280 ℃ and 1300 ℃ for 1 hour separately after shaping them under pressure stress 500 MPa. The sintered alloys were studied by density test, tensile strength measurement, X-ray diffraction analysis （ XRD）, and fracture and structure observation. The results show that the density is 6.57 g/cm^3 （relative density is 94.3% ）and the tensile strength is 718.7 MPa for NiFe18.5Al25 alloy sintered at 1280 ℃ ,which prove that powder metallurgy is a suitable method for high property Ni-Fe-Al Alloy. As the nickel content increasing,the volume fraction of γ-phase in studied alloys is increased, and it is same to their sintered density and tensile strength,which means that the γ-phase in the alloys is useful for the sintering process. Compared with three Ni-Fe-Al alloys, NiFe18.5 Al25 alloy has the best mechanical property for it possesses the most volume fraction of γ-phase in the alloy.

关 键 词：粉末冶金 Ni-Fe-Al合金 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]