摘要
在成功设计并制备出具有优异综合力学性能的网状结构TiBw/Ti6Al4V(TiBw/Ti64)复合材料的基础上,研究了轧制变形对新型网状结构TiBw/Ti64复合材料组织与性能的影响规律。利用扫描电镜观察不同变形量变形后的微观组织,分析结果显示,不同轧制变形量对应不同变形组织,随着轧制变形量的增加,网状结构TiBw/Ti64复合材料中增强相破碎加剧,局部增强相含量降低,且钛合金基体为转变β组织。拉伸性能结果表明,由于基体形变及热处理强化与增强相的破碎导致的弱化效果的共同作用,随着轧制变形量的增加,网状结构TiBw/Ti64复合材料抗拉强度及伸长率均先增加后降低。抗拉强度从1090MPa提高到1330MPa,相当于提高了22%,而伸长率最大提高了97%。
Based on the successful design and fabrication of network structured TiBw/Ti64 composites with a superior combination of mechanical properties, effects of hot rolling deformation on the microstructure and mechanical properties of TiBw/Ti64 composites with a network microstructure were investigated in the present study. The SEM microstructure results show that the microstructure of the deformed composites depends on the rolling reduction. In the TiBw/Ti64 composites with a network microstructure, the broken TiB whiskers gradually increase and the local volume fraction of TiBw reinforcement on the network boundary decreases with increasing the rolling reduction. The Ti64 matrix exhibits a transformed β microstructure. The tensile test results show that the ultimate tensile strength and elongation of the novel TiBw/Ti64 composites firstly increase and then decrease with increasing the rolling reduction. This phenomenon is attributed to the combined actions between the deformation and heat treatment strengthening effects of matrix and the weakening effect breaking the TiB whiskers. The ultimate tensile strength of the network structured TiBw/Ti64 composites is increased from 1090MPa to 1330MPa, that is to say, it is increased by 22%. Moreover, the elongation is increased by 97%.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2013年第2期8-12,共5页
Journal of Aeronautical Materials
基金
国家自然科学基金(51101042
51271064)
中央高校基本科研业务费专项资金资助(HIT.NSRIF.201131)
第五批中国博士后特别资助基金(2012T50327)
第50批中国博士后基金(2011M500653)
黑龙江省博士后基金
关键词
钛基复合材料
轧制变形
网状结构
微观组织
力学性能
titanium matrix composites （TMCs）
rolling deformation
network microstructure
microstructure
mechanical property
