摘要
以Ti-6Al-4V钛合金粉末和LaB_(6)粉末为原料,采用选择性激光熔化(SLM)技术制备原位自生TiB+La_(2)O_(3)/TC4钛基复合材料以及TC4钛合金,对比研究了复合材料和钛合金的物相组成、显微组织、硬度和抗压强度。结果表明:复合材料和钛合金的显微组织均为β柱状晶及晶内分布的针状α′马氏体,复合材料的β晶粒和α′马氏体集束的尺寸更细小,大角度晶界占比更高;LaB_(6)与钛元素发生原位反应生成TiB和La_(2)O_(3)增强体,TiB呈长条状沿一定方向分布,La_(2)O_(3)呈细小球状、弥散分布在晶界和晶内;复合材料的显微硬度和室温/高温抗压强度均高于钛合金的。
With Ti-6 Al-4 V titanium alloy powder and LaB_(6) powder as raw materials,the in-situ synthesized TiB+La_(2)O_(3)/TC4 titanium matrix composite and TC4 titanium alloy were prepared by selective laser melting.The phase compostion,microstructure,hardness and compressive strength of the composite and the titanium alloy were studied and compared.The results show that the microstructures of the composite and the titanium alloy were both composed of columnar β grains and acicularα′martensite distributed in grains.The size of the β grains and α′martensite clusters of the composite were smaller,and the proportion of large angle grain boundary was higher.TiB and La_(2)O_(3) reinforcements were formed by in-situ reaction of LaB_(6) and titanium.TiB was elongated and distributed along a certain direction.La_(2)O_(3) was in shape of small spheres,and dispersed on grain boundaries and in grains.The microhardness and room temperature/high temperature compressive strength of the composite were higher than those of the titanium alloy.
作者
张韦晨
李九霄
杨冬野
张馨月
郑沥昕
张雨桐
何凌欢
ZHANG Weichen;LI Jiuxiao;YANG Dongye;ZHANG Xinyue;ZHENG Lixin;ZHANG Yutong;HE Linghuan(School of Materials Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2021年第5期67-70,75,共5页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(51504151)
上海市“创新行动计划”基础研究项目(17JC1400600,17JC1400603)。
关键词
选择性激光熔化
钛基复合材料
原位自生增强体
显微组织
力学性能
selective laser melting
titanium matrix composite
in-situ synthesized reinforcement
microstructure
mechanical property
