Titanium self-diffusion and chemical diffusion in bcc TI-Al alloys

被引：22

作者：

Gerold, U ^{[1
]}

Herzig, C ^{[1
]}

机构：

[1] UNIV MUNSTER,INST MET FORSCH,D-48149 MUNSTER,GERMANY

来源：

DEFECT AND DIFFUSION FORUM | 1997年 / 143卷

关键词：

titanium self-diffusion; chemical diffusion; bcc Ti-Al alloys; aluminium diffusion;

D O I：

10.4028/www.scientific.net/DDF.143-147.437

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ti tracer diffusion was measured in dependence on temperature in the bcc Ti-Al alloys Ti90Al10 and Ti70Al30. The Arrhenius plots reveal a curvature similar to Ti self-diffusion in pure beta-Ti. D-Ti depends only very little on the Al concentration. Single phase interdiffusion was measured in the beta-phase field of the Ti-Al system in dependence on T and c(Al). The chemical diffusion coefficients (D) over tilde were determined by the Boltzmann-Matano analysis. Applying the Darken equation to D-Ti and (D) over tilde in combination with the thermodynamic factor, the Al tracer diffusion was calculated. It turns out that Ti diffuses faster than Al in the beta-phase field at concentrations below 25at% Al. For larger Al concentrations and higher temperatures (T>1720K) D-Al seems to exceed D-Ti.

引用

页码：437 / 442

页数：6

共 12 条

[1]

BORMANN R, COMMUNICATION

[2]

BUSCHER M, 1988, UNPUB

[3] SOLID-PHASE EQUILIBRIA IN THE TI-RICH PART OF THE TI-AL SYSTEM [J].

KAINUMA, R ;

PALM, M ;

INDEN, G .

INTERMETALLICS, 1994, 2 (04) :321-332

[4]

KOHLER U, 1988, PHILOS MAG A, V58, P769, DOI 10.1080/01418618808209952

[5] ON THE ANOMALOUS SELF-DIFFUSION IN BCC TITANIUM [J].

KOHLER, U ;

HERZIG, C .

PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1987, 144 (01) :243-251

[6]

KROLL S, 1992, Z METALLKD, V83, P591

[7] CROSS TERMS IN THERMODYNAMIC DIFFUSION EQUATIONS FOR MULTICOMPONENT ALLOYS [J].

MANNING, JR .

METALLURGICAL TRANSACTIONS, 1970, 1 (02) :499-&

[8] SELF-DIFFUSION IN BODY-CENTERED CUBIC TITANIUM-VANADIUM ALLOYS [J].

MURDOCK, JF ;

MCHARGUE, CJ .

ACTA METALLURGICA, 1968, 16 (04) :493-&

[9]

OUCHI K, 1980, TITANIUM 80, P559

[10]

Petry W., 1991, Diffusion and Defect Data - Solid State Data, Part A (Defect and Diffusion Forum), V75, P211

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