PREDICTION METHOD FOR THE SITE OCCUPATION OF 3RD ELEMENT IN TIAL PHASE

被引：24

作者：

HASHIMOTO, K ^{[1
]}

DOI, H ^{[1
]}

TSUJIMOTO, T ^{[1
]}

SUZUKI, T ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,FAC ENGN,DEPT MET,MEGURO,TOKYO 154,JAPAN

来源：

MATERIALS TRANSACTIONS JIM | 1991年 / 32卷 / 07期

关键词：

INTERMETALLIC COMPOUND; TITANIUM ALUMINIDE; TIAL PHASE; OCCUPATION SITE; ADDITIVE ELEMENT; X-RAY ANALYSIS; SUBSTITUTION BEHAVIOR; LATTICE SPACING; L10-TYPE CRYSTAL;

D O I：

10.2320/matertrans1989.32.574

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Two prediction methods for the site occupation of the third elements in L1(0)-type TiAl alloys have been proposed. One was derived from the empirical rule where the change of lattice parameters, a and c, of the TiAl phase with the addition of third elements is taken account of. Here, the parameters a and c satisfied the following two conditions. (1) The axial ratio, c/a, decreases with increasing the atom diameter ratio, D-alpha/D-beta. Here, D-alpha or D-beta is the average diameter of atom which occupies the alpha- or beta-sublattice in the L1(0)-type crystal lattice. (2) The ratio of D-alpha/D-beta and the value of (D-alpha-(a/square-root 2))/D-beta converge into a narrow range. The other was obtained from the interaction parameters of the constituent atoms in the TiAl phase. In addition, the amount of site occupation of the third elements, Ag, Fe, Ga, Ni and Pt, and that of host elements in the TiAl phase were determined by an X-ray analysis. The occupation amounts of the additives predicted by the former method agreed well with those determined by X-ray analysis.

引用

页码：574 / 579

页数：6

共 16 条

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