MICROSTRUCTURE EFFECT ON ENHANCEMENT OF ROOM-TEMPERATURE DUCTILITY IN β-Ti CONTAINING γ-TIAL BASED ALLOYS

被引：0

作者：

Yamagata, Ryosuke ^{[1
]}

Okada, Yotaro ^{[1
]}

Nakashima, Hirotoyo ^{[1
]}

Takeyama, Masao ^{[1
]}

机构：

[1] Tokyo Inst Technol, Sch Mat & Chem Technol, Dept Mat Sci & Engn, Meguro Ku, S8-8,2-12-1 Ookayama, Tokyo 1528550, Japan

来源：

JOINT EPRI - 123HIMAT INTERNATIONAL CONFERENCE ON ADVANCES IN HIGH-TEMPERATURE MATERIALS, 2019 | 2019年

关键词：

CRACK GROWTH-BEHAVIOR; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; EVOLUTION; FRACTURE; DESIGN;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Effects of microstructure constituents of alpha(2)-Ti3Al/gamma-TiAl lamellae, beta-Ti grains and gamma grains, with various volume fractions on room-temperature ductility of gamma-TiAl based alloys have been studied. The ductility of the alloys containing beta phase of about 20% in volume increases to more than 1% as the volume fraction of gamma phase increases to 80%. However, gamma single phase alloys show very limited ductility of less than 0.2%. Microstructure analysis have revealed that intragranular fracture along gamma/gamma grain boundary occurred in y single phase alloy whereas it does not along beta/gamma interphase in alloys containing beta phase. In addition, local strain accumulations along beta/gamma interphase have been confirmed. The present results, thus, confirmed the significant contribution of beta phase, especially the existence of beta/gamma interphase to enhancement of the room -temperature ductility in multi-component TiAl alloys.

引用

页码：1446 / 1456

页数：11

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