摘要
采用机械合金化方法获得NiAl(Co)纳米晶粉末 ,经过热压 ,成功地制备出NiAl(Co)块体纳米晶材料·其晶粒尺寸约在 30 0～ 480nm ,致密度可达到 91%以上 ,室温压缩屈服强度达到12 5 0～ 140 0MPa ,是铸态NiAl合金的 3 1～ 3 5倍 ,室温塑性良好 ,有大约 13 %的压缩塑性·其中Ni50 Al4 0 Co10 纳米晶块体材料压缩率可达 30 % ,而无裂纹产生 ;Ni50 Al4 5Co5,在 980℃高温压缩至19 5 %无裂纹产生 ,变形均匀·还发现含γ′相的NiAl(Co)的双相纳米晶块体材料压缩性能优于单相NiAl(Co)
The NiAl(Co)bulk nano materials with the grain from 300 to 480 nm and 91% densified degree of the compacts, were prepared by NiAl(Co) nano powder by hot pressing(HP). At room temperature, the compress yields strength of bulk nano material is 1?250～1?400?MPa, which is 3 1～3 5 times than that of the cast NiAl. In the compressive experiments the nano materials have good compressive plasticity at room temperature,Ni 50 Al 40 Co 10 nano materials can be compressed higher than 30% without crack, and Ni 50 Al 45 Co 5 nano materials in 980?℃ can be compressed 19.5% without fracture. Moreover,the properties of the double phase nano materials containing γ'are better than to those of single phase nano materials.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2001年第5期584-587,共4页
Journal of Northeastern University(Natural Science)
基金
国家'八六三'高技术计划项目 ( 715 0 0 5 0 0 30 )
国家重点基础研究发展规划项目 ( 5 9895 15 0 )
