Microstructure and Mechanical Properties of in-situ Synthesized TiB+La2O3/TC4Titanium Matrix Composite by Selective Laser Melting
摘 要
以Ti-6Al-4V钛合金粉末和LaB6粉末为原料,采用选择性激光熔化(SLM)技术制备原位自生TiB+La2O3/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;LaB6与钛元素发生原位反应生成TiB和La2O3增强体,TiB呈长条状沿一定方向分布,La2O3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。
Abstract
With Ti-6Al-4V titanium alloy powder and LaB6 powder as raw materials, the in-situ synthesized TiB+La2O3/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 acicular α' 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 La2O3 reinforcements were formed by in-situ reaction of LaB6 and titanium. TiB was elongated and distributed along a certain direction. La2O3 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.
中图分类号 O436 DOI 10.11973/jxgccl202105012
所属栏目 材料性能及应用
基金项目 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)
收稿日期 2020/7/1
修改稿日期 2021/4/20
网络出版日期
作者单位点击查看
备注张韦晨(2000-),男,安徽阜阳人,本科生
引用该论文: ZHANG Weichen,LI Jiuxiao,YANG Dongye,ZHANG Xinyue,ZHENG Lixin,ZHANG Yutong,HE Linghuan. Microstructure and Mechanical Properties of in-situ Synthesized TiB+La2O3/TC4Titanium Matrix Composite by Selective Laser Melting[J]. Materials for mechancial engineering, 2021, 45(5): 67~70
张韦晨,李九霄,杨冬野,张馨月,郑沥昕,张雨桐,何凌欢. 选择性激光熔化原位自生TiB+La2O3/TC4钛基复合材料的组织和力学性能[J]. 机械工程材料, 2021, 45(5): 67~70
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【6】KANG N,CODDET P,LIU Q,et al.In-situ TiB/near α Ti matrix composites manufactured by selective laser melting[J].Additive Manufacturing,2016,11:1-6.
【7】HE B B,CHANG K,WU W H,et al.The formation mechanism of TiC reinforcement and improved tensile strength in additive manufactured Ti matrix nanocomposite[J].Vacuum,2017,143:23-27.
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