Diffusion in the Ti-Al-V System

被引：30

作者：

Lindwall, Greta ^{[1
,2
]}

Moon, Kil-Won ^{[1
]}

Chen, Zhangqi ^{[3
]}

Mengason, Michael ^{[4
]}

Williams, Maureen E. ^{[1
]}

Gorham, Justin M. ^{[4
]}

Zhao, Ji-Cheng ^{[3
]}

Campbell, Carelyn E. ^{[1
]}

机构：

[1] NIST, Mat Sci & Engn Div, 100 Bur Dr, Gaithersburg, MD 20899 USA

[2] KTH Royal Inst Technol, Dept Mat Sci & Engn, S-10044 Stockholm, Sweden

[3] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA

[4] NIST, Mat Measurement Sci Div, 100 Bur Dr, Gaithersburg, MD 20899 USA

来源：

JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION | 2018年 / 39卷 / 05期

基金：

美国国家科学基金会;

关键词：

CALPHAD; diffusion couples; diffusion modeling; interdiffusion; Ti-Al-V; FCC CR-FE; SELF-DIFFUSION; BCC PHASE; IMPURITY DIFFUSION; ALPHA-TI; TITANIUM-VANADIUM; SOLUTE DIFFUSION; BETA-PHASE; INTERDIFFUSION; NI;

D O I：

10.1007/s11669-018-0673-9

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：

Diffusion in the Ti-Al-V system is studied and a CALculation of Phase Diagrams (CALPHAD) diffusion mobility description is developed. Diffusion couple experiments are performed to obtain diffusion paths in the hcp phase at 923 K, 1023 K and 1123 K. The diffusion coefficient of V in the hcp-Ti phase is found to decrease with increasing Al alloying. A forward-simulation analysis is used to evaluate the impurity diffusion coefficient for Al and V diffusion in the hcp Ti-V and the Ti-Al systems which are used as input in the mobility modeling. The composition dependency for the diffusion in the hcp phase in the ternary system is accounted for and a CALPHAD diffusion mobility description is obtained by directly optimizing the mobility parameters as a function of the experimental composition profiles from the diffusion couples. Both experimental data and previous diffusion mobility descriptions in the literature for the bcc Ti-Al-V phase are adopted. A complete description of diffusion in both the hcp and bcc phases for the Ti-Al-V system is presented with the aim to be used for design of Ti alloys and processes.

引用

页码：731 / 746

页数：16

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