Microstructure and Mechanical Properties of TiAl-based Alloy |
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作者单位: | Zhongjie PU Jiandong SHI Dunxu ZOU Zengyong ZHONG Central Iron and Steel Research Institute,Beijing,100081,China |
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摘 要: | Two phases gamma titanium aluminide alloy,Ti-46.5Al-2.5V-1Cr.was investigated to characterizemicrostructures and to define the microstructure/mechanical property relationship.Many kinds ofmicrostructure of gamma and α_2 phases were obtained by heat treatments in the α+γ,α_2+γ and αfields.The effects of microstructure on tensile properties,fracture toughness and J-R resistancecurve at room temperature,were systematically studied.The experimental results showed that themicrostructure had a strong effect on mechanical properties,The duplex microstructure produced byheat treatment at 1250℃×4 h with controlled cooling resulted in the highest ductility of 4.8% tensileelongation,low fracture toughness and crack growth resistance.The fully lamellar microstructureproduced by heat treatment in the α field having large grain sizes resulted in the highest fracturetoughness but the lowest ductility.
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收稿时间: | 1993-11-28 |
Microstructure and Mechanical Properties of TiAl-based Alloy |
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Authors: | Zhongjie PU Jiandong SHI Dunxu ZOU Zengyong ZHONG Central Iron and Steel Research Institute Beijing China |
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Abstract: | Two phases gamma titanium aluminide alloy,Ti-46.5Al-2.5V-1Cr.was investigated to characterize microstructures and to define the microstructure/mechanical property relationship.Many kinds of microstructure of gamma and α_2 phases were obtained by heat treatments in the α+γ,α_2+γ and α fields.The effects of microstructure on tensile properties,fracture toughness and J-R resistance curve at room temperature,were systematically studied.The experimental results showed that the microstructure had a strong effect on mechanical properties,The duplex microstructure produced by heat treatment at 1250℃×4 h with controlled cooling resulted in the highest ductility of 4.8% tensile elongation,low fracture toughness and crack growth resistance.The fully lamellar microstructure produced by heat treatment in the α field having large grain sizes resulted in the highest fracture toughness but the lowest ductility. |
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Keywords: | microstructure mechanical property TiAI alloy |
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