Effects of Thermal Exposure on the Tensile and Fatigue Properties of Cast Ti—47Al—2Cr—2Nb--0.15B Alloy

Acta Metall Sin

2005, Vol. 41

Issue (1): 108- DOI:

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Effects of Thermal Exposure on the Tensile and Fatigue Properties of Cast Ti—47Al—2Cr—2Nb--0.15B Alloy

CUI Yuyou; XIANG Hongfu; JIA Qing; YANG Rui

Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016

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CUI Yuyou; XIANG Hongfu; JIA Qing; YANG Rui. Effects of Thermal Exposure on the Tensile and Fatigue Properties of Cast Ti—47Al—2Cr—2Nb--0.15B Alloy. Acta Metall Sin, 2005, 41(1): 108-.

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Abstract The elevated temperature fatigue strength and room temperature tensile properties and fatigue strength of cast Ti-47Al-2Cr-2Nb-0.15B(atomic fraction, %) alloy after thermal exposure were investigated. The microstructural change of the bulk alloy and the microstructure of surface layer after 650℃/100 h and 800℃/100 h exposures were analyzed by means of XRD and SEM. The room temperature tensile ductility and fatigue strength decreased slowly with increasing exposure temperature when it is below 650℃, and then rapidly decreased above this temperature. Dependence of fatigue strength for the unexposed alloy with test temperature exhibits the same trend. The surface layer formed after 650℃/100 h exposure is an oxygen-enriched layer, while that after 800℃/100 h exposure is an oxide layer consisting of TiO2 and Al2O3. Such a change in the nature of the surface layer corresponds to the onset of rapid drop in mechanical proerties and fatigue strength of the alloy with increasing exposure temperature.

Key words: TiAl alloy thermal exposure room temperature ductility fatigue strength

Received: 11 February 2004

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