A COMPONENT-SPECIFIC ALLOY DESIGN OF TiAl INTERMETALLICS

Abstract

Abstract: The metallographic observation and analyses of TiAl alloy cast ingots revealed that the preferably arranged γ/α_2 lamellar microstructure can be obtained in columnar dendritic cast ingot through controlling the Ti/Al atomic ratio. The experiments conf irmed that the preferably arranged γ/α_2 lamellar microstructure has excellent tensile strength and fracture toughness and tolerant tensile plasticity when the stress is applied parallel to the γ/α_2 interface.Based on these results and the working condition of the turbine blades,a component-specific alloy design has been suggested.

Key words: TiAl intermetallics, lamellar microstructure, mechanical propErty

J.Zhang;D.X. Zou; Z.Z. Zhang and Z. Y Zhong(Central Iron & Steel Research Institute, Beijing 100081, China Manuscript received 26 August 1996). A COMPONENT-SPECIFIC ALLOY DESIGN OF TiAl INTERMETALLICS[J]. Acta Metallurgica Sinica (English Letters), 1996, 9(6): 571-575.

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A COMPONENT-SPECIFIC ALLOY DESIGN OF TiAl INTERMETALLICS

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