EFFECT OF IRON ADDITIONS ON STRUCTURE OF LAVES PHASES IN NB-CR-FE ALLOYS

被引：38

作者：

GRUJICIC, M ^{[1
]}

TANGRILA, S ^{[1
]}

CAVIN, OB ^{[1
]}

PORTER, WD ^{[1
]}

HUBBARD, CR ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB, HIGH TEMP MAT LAB, OAK RIDGE, TN 37831 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1993年 / 160卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0921-5093(93)90495-Z

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of iron additions on the stability of various Laves phases in the Nb-Cr base system has been examined. In the binary Nb-Cr system a hexagonal (C14) Laves phase exists at temperatures above approximately 1860 K, and undergoes a shear-like martensitic transformation to a face centered cubic (C15) Laves phase on cooling to room temperature. Addition of iron promotes formation of an additional phase, the dihexagonal (C36) Laves phase. In alloys with a lower iron content (below approximately 5 wt.%), the C36 phase forms at higher temperatures. In addition, the C15 phase begins to form on cooling to room temperature. In sharp contrast, in alloys with a higher iron content, only the C14 --> C36 phase transformation takes place in the entire temperature range studied (RT 1473 K). These findings were rationalized on the basis of the effects of chemical energy change and elastic strain energy on magnitude of the activation energy for martensitic transformation.

引用

页码：37 / 48

页数：12

共 11 条

[1]

ALLEN CW, 1979, P INT C MART T ICOMA, P124

[2]

[Anonymous], 1993, ELEMENTS XRAY DIFFRA

[3]

[Anonymous], 1958, HDB LATTICE SPACINGS

[4]

Askill J., 1970, TRACER DIFFUSION DAT, DOI [10.1007/978-1-4684-6075-9, DOI 10.1007/978-1-4684-6075-9]

[5]

DUWEZ P, 1952, J MET, V12, P72

[6]

Laves F., 1935, MET TECHNOL, V14, P645

[7]

MASSALSKI T, 1988, BINARY ALLOY PHASE D

[8]

SINHA AK, 1972, PROGR MATERIALS SCI

[9]

TANGRILA S, 1992, THESIS CLEMSON U CLE

[10]

1952, INT TABLES XRAY DIFF

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