Hot working characteristics of a high Nb containing TiAl alloy with ( γ+β ) microstructure

被引：2
|
作者：
Ge, Gengwu [1 ]
Zhang, Laiqi [1 ]
Lin, Junpin [1 ]
机构：
[1] State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
来源：
MATERIALS TODAY COMMUNICATIONS | 2024年 / 40卷
基金：
北京市自然科学基金;
关键词：
High Nb containing TiAl alloy; beta phase; Hot working characteristics; Microstructure evolution; DEFORMATION-BEHAVIOR; NIOBIUM;
D O I：
10.1016/j.mtcomm.2024.109849
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, the hot working characteristics of a (3-solidifying gamma-TiAl alloy with (gamma+(3) microstructure were systematically investigated. The effects of temperature, strain rate, and deformation degree on microstructure evolution were examined. As temperature increased and strain rate decreased, the microstructure underwent complete dynamic recrystallization, necessitating a height reduction exceeding 40 %. Utilizing the compressive data, the constitutive equation was established through the strain iteration method. Furthermore, a hot processing map using this constitutive equation was generated, which exhibited high accuracy and could effectively predict microstructure. In the domain of high temperature and low strain rate, the majority of energy was directed towards promoting microstructure evolution, leading to a peak in power dissipation efficiency. Optimal hot working conditions for this alloy falls at temperatures ranging from 1273 K to 1473 K or higher, with a strain rate not exceeding 0.1 s- 1 .
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页数：11
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