Microstructure evolution and mechanical properties of in-situ Ti6Al4V-TiB composites manufactured by selective laser melting

被引：135
作者：
Zhou, Zhiguang [1 ,2 ]
Liu, Yunzhong [1 ,2 ]
Liu, Xiaohui [1 ,2 ]
Zhan, Qiangkun [1 ,2 ]
Wang, Kaidong [1 ,2 ]
机构：
[1] South China Univ Technol, Guangdong Prov Key Lab Proc & Forming Adv Metall, Guangzhou 510640, Peoples R China
[2] South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Metall M, Guangzhou 510640, Peoples R China
来源：
COMPOSITES PART B-ENGINEERING | 2021年 / 207卷
基金：
国家重点研发计划;
关键词：
Titanium matrix composites; Selective laser melting; TiB; Mechanical properties; TITANIUM MATRIX COMPOSITES; REINFORCEMENT ARCHITECTURE; STEEL NANOCOMPOSITES; METALLIC COMPONENTS; TEMPERATURE; TI-6AL-4V; STRENGTH; DENSIFICATION; ENHANCEMENT; PERFORMANCE;
D O I：
10.1016/j.compositesb.2020.108567
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In situ TiB reinforced titanium matrix composites (TMCs) were fabricated by selective laser melting (SLM) of ball-milled Ti6Al4V-TiB2 powders. Optimized SLM processing and stress relief annealing were applied to obtain crack-free and fully dense composites. TiB reinforcement is mainly present in the form of whisker clusters and exhibits a quasi-continuous distribution in TMC1 (2 vol%TiB) while a full-continuous distribution in TMC2 (5 vol %TiB). The distribution of TiB whisker clusters in primary beta-Ti grain is not consistent with the complete dissolution mechanism proposed previously. As a result, a dual mechanism of direct reaction and precipitation has been put forward to describe the formation of TiB phase. The microhardness, compressive strength and tensile strength of TMC1 are improved by 14%, 36%, 25% respectively, compared with those of Ti6Al4V alloy. These enhancements can be mainly attributed to Hall-Petch strengthening and load-bearing transformation strengthening. The fracture surface of TMC1 after tensile testing shows a mixture of regions of cleavage facets with regions of small dimples.
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页数：10
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