Microstructure of Al3Sc with ternary rare-earth additions

被引：79

作者：

Harada, Y. ^{[1
]}

Dunand, D. C. ^{[2
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Adv Mfg Res Inst, Tsukuba, Ibaraki 3058564, Japan

[2] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

来源：

INTERMETALLICS | 2009年 / 17卷 / 1-2期

关键词：

Trialuminides; Rare-earth intermetallics; Solid-solution hardening; Microstructure; Diffraction; MECHANICAL-PROPERTIES; ELEVATED-TEMPERATURES; CREEP-PROPERTIES; AL(SC) ALLOYS; SC; PRECIPITATION; FRACTURE; ELEMENT; AMBIENT; ZR;

D O I：

10.1016/j.intermet.2008.09.002

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 microstructure of ternary L1(2)-Al-3(Sc1-yREy) intermetallics, where RE is one of the rare-earth elements selected from five light (La, Ce, Nd, Son or Eu) or two heavy lanthanoids (Yb or Lu), was investigated as a function of RE concentration for 0.02 <= y <= 0.75. Alloys with light RE show two phases: L1(2)-Al-3(Sc,RE) and D0(19)-Al-3(RE,Sc) (or C11(b)-Al-4(Eu,Sc)). Alloys with heavy RE exhibit a single L1(2)-Al-3(Sc,RE) phase. The maximum RE solubility in the L1(2) phase is very low (<0.4 at.%) for La, Ce, Nd and Eu, low (3.2 at.%) for Sm and complete solid-solution for Yb and Lu. Both lattice parameter and hardness of the L1(2)-Al-3(Sc,RE) phases increase linearly with Sm, Yb or Lu concentration, and the magnitude of both effects correlates with the atomic size mismatch between Sc and RE. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：17 / 24

页数：8

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