Nb对Ti/Al_2O_3复合材料力学性能的影响

Influence of Nb additive on the mechanical properties of Ti/Al_2O_3 composites

研究了热压烧结条件下Nb元素对Ti/ [φ(Al2 O3 ) =80 % ]复合材料相对密度、抗弯强度、断裂韧性及维氏硬度等力学性能的影响 ,分析了其影响机理。结果表明 ,在Ti/ [φ(Al2 O3 ) =80 % ]的Al2 O3 复合材料中掺入Nb元素 ,材料的微观组织形貌得以细化 ,性能有了较大提高。随Nb掺量的增加 ,材料的相对密度、维氏硬度与抗弯强度先增大后减小 ,当掺量为 φ =1.5 %时 ,其相对密度、抗弯强度、维氏硬度达到最高 ,分别为 98.13%、5 0 1.0 6MPa和 2 0 .31GPa ,断裂韧性随Nb掺量的增加而增大 ,当掺量为 φ =2 %时 ,其断裂韧性为5 .2 4MPa·m1/ 2 。

The effect of Nb additives on the relative density, bending strength,fracture toughness and micro-hardness of Ti/φ(Al 2O 3=80%)composite was studied,and the mechanism were analyzed.The results indicated,adding Nb additive,that the composite organization finer and mechanical properties improved.With increasing Nb content the relative density and bending strength increased first and then decreased.The relative density,bending strength and micro-hardness were 98.13%,501.06?MPa and 20.31?GPa respectively,reaching the maximum when the Nb content was φ=1.5%.The fracture toughness was 5.24?MPa.m 1/2 with 2vol%Nb.