Multiphase polymorphic nanoparticles reinforced titanium matrix composite produced by selective electron beam melting of a prealloyed composite powder
Multiphase polymorphic nanoparticles reinforced titanium matrix composite produced by selective electron beam melting of a prealloyed composite powder
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DOI：
10.1016/j.scriptamat.2021.113916
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发表时间：
2021-04-16
影响因子：
6
通讯作者：
Zhang, D. L.
中科院分区：
文献类型：
--
作者：
Niu, H. Z.;Yin, B. G.;Zhang, D. L.
A Ti-6Al-3Sn-4Zr-0.9Mo-0.4Si-0.4Y-0.5B（wt.%）采用选择性电子束熔炼（EBM）技术制备了多相多晶TiB晶须、Y2 O3和（Ti，Zr）（5）Si 3纳米颗粒的钛合金基复合材料（TMC）。在EBM过程中的快速亚共晶凝固导致柱状枝晶组织与三维细网络的TiB晶须和Y2 O3纳米颗粒均匀分布在母β-Ti相的枝晶间区域。这种EBM制造的TMC在室温和高达700摄氏度的高温下与其基体合金相比具有显著增强的拉伸强度和硬度。EBM构建的TMC的极限拉伸强度达到1185 MPa，室温下的断裂伸长率为3.2%，并且在600 ℃下仍然保持750 MPa的高值。该研究为制备多相多晶增强体和复杂形状的高性能TMCs构件开辟了一条新途径。(C)2021 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
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.