Effect of hot rolling on the microstructure and mechanical properties of Ti{sub 3}Al based dual phase alloys

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:20001602

Wu, J; Zhang, L; Hua, W; Qiu, G

Development of {alpha}{sub 2}-Ti{sub 3}Al based dual phase alloys have shown some promising potentials in property improvement by introducing Ti{sub 5}Si{sub 3} silicide phase into the matrix via Si alloying. However, the presence of coarse network of Ti{sub 5}Si{sub 3} phase formed by eutectic reaction in the as-cast state also embrittles the alloy. Both hot rolling and powder metallurgy are considered to be the possible ways to refine the Ti{sub 5}Si{sub 3} phase in the matrix. Two Ti-Al-Si-Nb alloys whose Si contents are 2 and 5 at.% respectively were arc melted into ingots and then hot rolled to sheets in this investigation. Optical metallographic examination correlates the microstructures of the as-cast and as-rolled alloys with the different rolling amounts, showing that the coarse silicide network is broken into small particles after hot rolling. Mechanical property testing from room temperature to 800 C indicates that the strength and plastic elongation of the hot-rolled alloys are much higher than those of the as-cast ones. The data obtained in this investigation are comparable with those obtained in the P/M processed specimens. Fracture surfaces of the alloys are also examined.

• Research Organization: Shanghai Jiao Tong Univ. (CN)
• OSTI ID: 20001602
• Report Number(s): CONF-981104--; ISBN 1-55899-458-0; ISSN 1067-9995
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
EXPERIMENTAL DATA
FRACTOGRAPHY
HOT WORKING
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NIOBIUM ALLOYS
ROLLING
SILICON ALLOYS
TEMPERATURE DEPENDENCE
TITANIUM ALLOYS