Characterization of two-phase B2-HCP alloys in the Ru-Al-Cr system

被引：2

作者：

Acosta, M. ^{[1
]}

Reynolds, T. D. ^{[1
]}

Johnson, D. R. ^{[1
]}

Kvam, E. P. ^{[1
]}

机构：

[1] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47906 USA

来源：

INTERMETALLICS | 2010年 / 18卷 / 12期

关键词：

Ternary alloy systems; Phase diagrams; Precipitates; Phase interfaces; Electron Microscopy; Scanning and Transmission; TEMPERATURE INTERMETALLIC COMPOUNDS; MECHANICAL-PROPERTIES; ALUMINUM-RUTHENIUM; MICROSTRUCTURE; OXIDATION; ADDITIONS; BEHAVIOR; PHASE;

D O I：

10.1016/j.intermet.2010.07.016

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：

Alloys of Ru-Al-Cr produced by arc-melting and by directional solidification at 20 mm/h were heat treated at 1100 degrees C and 1500 degrees C. Partial isothermal sections at 1100 degrees C and 1500 degrees C were constructed using the results from scanning (SEM) and transmission (TEM) electron microscopy. Both isothermal sections displayed a large B2 region with a composition extending towards Ru-20Al-38Cr at%. The directionally solidified Ru-6Al-38Cr and Ru-4Al-41Cr (at%) alloys exhibited uniformly distributed B2 precipitates in an HCP matrix after heat treatment at 1100 degrees C for 200 h. The Burgers orientation relationship of ((0001)(HCP)//(011)(B2), [2 (11) over bar0](HCP)//[1 (1) over bar1](B2)) was found between the HCP matrix and the semicoherent B2 precipitates by TEM. A uniform Al compositional profile within the B2 precipitates was found using STEM while limited solubility was detected in the matrix. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：2281 / 2288

页数：8

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