Mechanical and microstructural responses and microcrack formation in titanium aluminides at a wide range of strain rate and temperature

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:532528

Jin, Z; Cady, C; Vaidya, R U; Butt, D P; Gray, III, G T ^[1]; Kim, Y W ^[2]; Yamaguchi, Masaharu ^[3]

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1. Los Alamos National Lab., NM (United States)
2. Universal Energy Systems Inc., Dayton, OH (United States)
3. Kyoto Univ. (Japan)

Significant progress has been made in the development of titanium aluminide alloys for high temperature and high performance applications in the last decade. An extensive database on the mechanical and microstructural responses of titanium aluminides under various quasi-static loading conditions has been developed. However, knowledge of the mechanical and microstructural responses of titanium aluminides under dynamic loading conditions remains poorly understood. A systematic investigation of the strain rate and temperature effect on mechanical and microstructural responses, microcrack nucleation and microcrack propagation in three titanium aluminide alloys, a polysynthetically twinned (PST) TiAl crystal, a duplex {gamma}-TiAl alloy and a polycrystalline Ti{sub 3}Al-based alloy, was carried out in this study. The mechanical behavior observed in these three alloys will be interpreted based on the characterized deformation microstructures. Microcrack nucleation and propagation mechanisms will be discussed in detail in terms of the observed mechanical and microstructural responses of these alloys.

• Research Organization: Los Alamos National Lab., NM (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 532528
• Report Number(s): LA-UR--96-3778; CONF-970909--1; ON: DE97002344
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CRACK PROPAGATION
HEAT RESISTING ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
STRAIN RATE
TEMPERATURE DEPENDENCE
TITANIUM ALLOYS