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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2010, Vol. 11 Issue (10): 738-743    DOI: 10.1631/jzus.A1000138
    
Promoting the mechanical properties of Ti42Al9V0.3Y alloy by hot extrusion in the α+β phase region
Wen-chen Xu, Hao Zhang, De-bin Shan
Department of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
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Abstract  Hot extrusion was conducted in the α+β phase region for promoting mechanical properties of Ti42Al9V0.3Y. The microstructures and tensile properties before and after hot extrusion were studied. The results show that the microstructure of the as-cast alloy mainly consists of massive γ phase in β matrix and the as-extruded alloy mainly consists of lamellar α2/γ, lamellar β/γ, and strip γ propagating from elongated β phase. In the as-cast alloy, the predominantly observed fracture mode is transgranular cleavage failure at room temperature and intergranular fracture at 650–750 °C. After hot extrusion, it transforms into transgranular cleavage-like failure, including translamellar cleavage and delamination. The excellent tensile properties of the as-extruded material are attributed to the obvious refined microstructure with broken YAl2 particles and the micro-crack shielding action of the TiAl lamellasome.

Key words： TiAl alloy      Microstructure      Mechanical property      Hot extrusion     
Received: 02 April 2010      Published: 05 October 2010
CLC:  TG113.25  
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De-bin Shan
Wen-chen Xu
Hao Zhang
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Wen-chen Xu, Hao Zhang, De-bin Shan. Promoting the mechanical properties of Ti42Al9V0.3Y alloy by hot extrusion in the α+β phase region. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2010, 11(10): 738-743.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1000138     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2010/V11/I10/738

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