Concentration-dependent diffusion kinetics of Ti-Al binary system at elevated temperatures: Experiments and modeling

被引：15
作者：
Wu, Hao [1 ]
Zhang, Shihao [1 ,2 ]
Hu, Haibo [1 ]
Li, Jinkai [1 ]
Wu, Junyan [1 ]
Li, Qinggang [1 ]
Wang, Zhi [1 ]
机构：
[1] Univ Jinan, Sch Mat Sci & Engn, Jinan 250022, Shandong, Peoples R China
[2] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China
来源：
INTERMETALLICS | 2019年 / 110卷
基金：
中国国家自然科学基金;
关键词：
Titanium aluminides; Annealing; Diffusion; Kinetics; Modeling; Concentration gradient; SELF-DIFFUSION; TRACER DIFFUSION; SINGLE-PHASE; INTERDIFFUSION; COEFFICIENTS; TITANIUM; BEHAVIOR; COUPLE; COMPOSITES; ALUMINUM;
D O I：
10.1016/j.intermet.2019.106483
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：
The aim of the present work is to investigate the dependence of concentration gradient on diffusion kinetics of Ti-Al binary system at high temperatures, which is a long-standing physical problem that cannot easily addressed by tradition diffusion couple experiments due to the ultralow melting point of Al and complicated compositions of various titanium aluminides. We conceived and established a simplified Fick-based diffusion model, making use of successive concentration gradient, in combination with experiments, to reveal the concentration-governed diffusion behavior. Our results showed an excellent agreement with currently available diffusion models. Therefore this approach was expected to be extensively applied to other binary system with large deviations in the melting points.
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页数：8
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