Microstructural control of TiAl-Mo-B alloys by directional solidification

被引：79

作者：

Johnson, DR ^{[1
]}

Chihara, K ^{[1
]}

Inui, H ^{[1
]}

Yamaguchi, M ^{[1
]}

机构：

[1] Kyoto Univ, Dept Mat Sci & Engn, Sakyo Ku, Kyoto 60601, Japan

来源：

ACTA MATERIALIA | 1998年 / 46卷 / 18期

基金：

日本学术振兴会;

关键词：

D O I：

10.1016/S1359-6454(98)00310-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Directional solidification experiments were performed to see if the gamma/alpha(2) lamellar boundaries could be aligned parallel to the growth direction for an ingot containing columnar lamellar grains. From microstructural analysis of arc-melted ingots, a projection of the partial liquidus surface for the Ti-Al-Mo system was constructed and this was used with an analytical description of the phase diagram to calculate the solidification paths. Following this analysis, Ti-Al-Mo(+B) ingots were directionally solidified at growth rates between 40 and 100 mm/h. By controlling the solidification path, a possible processing window where a reasonably well aligned gamma/alpha(2) microstructure can be produced was identified. As-processed microstructures exhibited a compressive yield strength greater than 500 MPa at 800 degrees C and 2% ductility at room temperature. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：6529 / 6540

页数：12

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