摘要
对不同Zr含量Ni3Al的力学性能及晶界的研究结果表明:随Zr含量的增加,合金的屈服强度和抗张强度不断提高;当Zr≤0.7at.-%时,塑性随Zr含量的增加而提高;但Zr含量达1.2at.-%时,Zr的增塑效果下降.Auger能谱分析表明:Zr在晶界有偏聚,偏聚因子约为3.断口观察显示:不含Zr或Zr含量为1.2at.-%的Ni-24.0Al合金均为沿晶断裂,其余含Zr合金的断裂方式为穿晶、沿晶混合断裂.这表明:含Zr的Ni3Al塑性和Zr在晶界的偏聚有密切关系.
The yield and ultimate strengths increase with the amount of Zr increasing. If an additive of Zr less than 0.7 at.-%. the elongation of the alloy increases with Zr content growing. If Zr added up to 1.2 at-%. the effect of Zr improving ductility of the alloy is fall off. Auger study indicated that the amount of Zr segregated to the GB is about 3 times greater than that in the bulk. SEM investigation showed that the fracture mode changes from intergranular in Ni-24.0 Al and Ni-24.0 Al-1.2Zr (in at.-%) alloys to the mixed of interand trans-granular in Ni-24.0 Al-0.3 Zr and Ni-24.0 Al-0.7 Zr (in at.-%) alloys. These results manifested that the effect of Zr improving the ductility in Ni3Al has strong relationship with the segregation of Zr at GB.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第3期A120-A124,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金