Plastic behavior of two-phase intermetallic compounds based on L1{sub 2}-type (Al,Cr){sub 3}Ti

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:225111

Park, J Y; Wee, D M ^[1]; Oh, M H ^[2]; Miura, S; Mishima, Y ^[3]

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1. Korea Advanced Inst. of Science and Technology, Taejon (Korea, Republic of). Dept. of Materials Science and Engineering
2. Kum-Oh National Univ. of Technology, Kumi (Korea, Republic of). Dept. of Materials Science and Engineering
3. Tokyo Inst. of Technology, Yokohama (Japan). Precision and Intelligence Lab.

Plastic behavior of two-phase intermetallic compounds based on L1{sub 2}-type (Al,Cr){sub 3}Ti was investigated using compression test at R.T. and 77K. L1{sub 2} single phase alloys and two-phase alloys consisting of mainly L1{sub 2} phase and a few or 20% (mole percent) second phases were selected from Al-Ti-Cr phase diagram. In general, compared with L1{sub 2} single phase, two-phase alloys consisting of 20% second phase showed relatively high yield strength and poor ductility. Among the alloys, however, Al-21Ti-23Cr alloy consisting of 20% Cr{sub 2}Al phase showed available ductility as well as high yield strength. Plastic behavior of L1{sub 2} single phase alloys and two-phase alloys consisting of a few Cr{sub 2}Al was also investigated. Homogenization of arc melted ingots substantially reduced the amount of second phases but introduced extensive pore. When Cr content increased in L1{sub 2} single phase alloys after the homogenization, the volume fraction of pores in the alloys decreased, and no residual porosity was observed in two-phase alloys consisting of a few% Cr{sub 2}Al phase. Environmental effect on the ductility of the alloys was investigated using compression test at different strain rates (1.2 {times} 10{sup {minus}4}/s and 1.2 {times} 10{sup {minus}2}/s). Environmental embrittlement was least significant in Al-25Ti-10Cr alloy consisting of L1{sub 2} single phase among the alloys tested in this study. However, based on the combined estimation of the pore formation, environmental embrittlement and ingot cast structure, it could be supposed that Al-21Ti-23Cr alloy consisting of 20% Cr{sub 2}Al as a second phase is expected to show the best tensile elongation behavior among the materials tested.

• OSTI ID: 225111
• Report Number(s): CONF-950201--; ISBN 0-87339-304-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
COMPRESSION STRENGTH
DUCTILITY
ELONGATION
EMBRITTLEMENT
ENVIRONMENT
INTERMETALLIC COMPOUNDS
OPTICAL MICROSCOPY
PHASE DIAGRAMS
PHASE STUDIES
PLASTICITY
SCANNING ELECTRON MICROSCOPY
STRAIN RATE
TENSILE PROPERTIES
TITANIUM ALLOYS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
YIELD STRENGTH