The effects of heat treatment on the microstructure and mechanical property of laser melting deposition γ-TiAl intermetallic alloys

被引：75
作者：
Qu, H. P. [1 ]
Li, P. [1 ]
Zhang, S. Q. [1 ]
Li, A. [1 ]
Wang, H. M. [1 ,2 ]
机构：
[1] Beijing Univ Aeronaut & Astronaut, Lab Laser Mat Proc & Mfg, Beijing 100191, Peoples R China
[2] Beijing Univ Aeronaut & Astronaut, Key Lab Aerosp Mat, Minist Educ China, Beijing 100191, Peoples R China
来源：
MATERIALS & DESIGN | 2010年 / 31卷 / 04期
基金：
中国国家自然科学基金;
关键词：
MA-PDS PROCESS; TENSILE PROPERTIES; FABRICATION; AL;
D O I：
10.1016/j.matdes.2009.10.045
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ti-47Al-2.5V-1Cr and Ti-40Al-2Cr (at.%) intermetallic alloys was fabricated by the laser melting deposition (LMD) manufacturing process. The microstructure was characterized by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The room-temperature (RT) tensile properties and Vickers hardness of the as-deposited and heat-treated specimens were evaluated on longitudinal directions. Results shows that full density columnar grain with fully lamellar (FL) microstructure consisted of gamma-TiAl and alpha(2)-Ti(3)Al was formed in the as-deposited gamma-TiAl samples. The room-temperature tensile strength of the as-deposited Ti-47Al-2.5V-1Cr alloy is up to approximately 650 MPa in the longitudinal direction and 600 MPa for the as-deposited Ti-40Al-2Cr alloy, while the tensile elongation is approximately 0.6% at most. Different microstructure types were obtained in the Ti-47Al-2.5V-1Cr and Ti-40Al-2Cr alloy after heat treatment. The stress-strain curve and the tensile fracture sub-surface indicate that the fracture manner of the as-deposited and heat-treated specimens was inter-granular manner. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：2201 / 2210
页数：10
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