Multiphase polymorphic nanoparticles reinforced titanium matrix composite produced by selective electron beam melting of a prealloyed composite powder

被引：30
|
作者：
Niu, H. Z. [1 ]
Yin, B. G. [1 ]
Zhang, H. R. [1 ]
Zang, M. C. [1 ]
Tan, H. [1 ]
Zhang, D. L. [1 ,2 ]
机构：
[1] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China
[2] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China
来源：
SCRIPTA MATERIALIA | 2021年 / 200卷
关键词：
Additive manufacturing; Titanium matrix nanocomposite; Hybrid reinforcement; Mechanical properties; IN-SITU; MECHANICAL-PROPERTIES; TIB WHISKERS; MICROSTRUCTURE; TI-6AL-4V; BEHAVIOR; TEXTURE; ALPHA;
D O I：
10.1016/j.scriptamat.2021.113916
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A Ti-6Al-3Sn-4Zr-0.9Mo-0.4Si-0.4Y-0.5B (wt.%) titanium alloy matrix composite (TMC) with multiphase polymorphic TiB whiskers and Y2O3 and (Ti, Zr)(5)Si-3 nanoparticles was successfully fabricated by selective electron beam melting (EBM) of a prealloyed composite powder. The rapid hypoeutectic solidification during EBM results in a columnar dendritic microstructure with three dimensional fine networks of TiB whiskers and Y2O3 nanoparticles uniformly distributed in the interdendritic regions of the parent beta-Ti phase. This EBM-built TMC exhibits a remarkably enhanced tensile strength and hardness compared with its matrix alloy at room temperature and elevated temperatures up to 700 degrees C. The ultimate tensile strength of the EBM-built TMC reaches 1185 MPa with an elongation to fracture of 3.2% at room temperature, and still retains a high value of 750 MPa at 600 degrees C. This study opens up a new way to manufacture high-performance components of TMCs with multiphase polymorphic reinforcements and complex shapes. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：7
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