Microstructure and mechanical properties of large size Ti-43Al-9V-0.2Y alloy pancake produced by pack-forging

被引：43
作者：
Su, Yongjun [1 ]
Kong, Fantao [1 ]
Chen, Yuyong [1 ]
Gao, Na [2 ]
Zhang, Deliang [3 ]
机构：
[1] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
[2] Univ South, Powder Mat Sci & Engn Ctr, Changsha 410083, Hunan, Peoples R China
[3] Univ Waikato, Sch Engn, Waikato Ctr Adv Mat, Hamilton, New Zealand
来源：
INTERMETALLICS | 2013年 / 34卷
基金：
中国国家自然科学基金;
关键词：
Titanium aluminides; based on TiAl; Isothermal forging; Heat treatment; Microstructure; Mechanical properties at ambient temperature; Mechanical properties at high temperatures; GAMMA-TITANIUM ALUMINIDES; TIAL ALLOYS; HEAT-TREATMENT; DEFORMATION-BEHAVIOR; TENSILE PROPERTIES; BETA-PHASE; DEFORMABILITY; REFINEMENT; METALLURGY; EVOLUTION;
D O I：
10.1016/j.intermet.2012.11.004
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A pancake of Ti-43Al-9V-0.2Y (at.%) alloy with dimensions of 0480 mm x 46 mm was fabricated by pack-forging with a thick reduction of 80%. The as-forged Ti-43Al-9V-0.2Y alloy pancake has a duplex (DP) microstructure, which is composed of B2/alpha(2)/gamma lamellar colonies and massive B2 and gamma phase regions distributed along the boundaries between the lamellar colonies. Different microstructures were obtained by heat treatment of samples cut from the as-forged Ti-43Al-9V-0.2Y alloy pancake. A fully lamellar (FL) structure consisting of B2/alpha(2)/gamma lamellar colonies was obtained after the heat treatment of 1350 degrees C/8 h. Tensile test results exhibited that the yield strength (YS) and ultimate tensile strength (UTS) of the alloy with DP microstructure were decreased from 680.7 MPa to 834.3 MPa at room temperature to 589.5 MPa and 693.1 MPa at 700 degrees C, respectively, and the elongation (delta) of the alloy with DP microstructure was increased from 1.99% at room temperature to 12.12% at 700 degrees C; the elongation (delta) of the alloy with FL microstructure was increased from 1.52% at room temperature to 85.84% at 800 degrees C. (C) 2012 Elsevier Ltd. All rights reserved.
引用
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页码：29 / 34
页数：6
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