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T45Al10Nb附帶 金全片層組織韌脆轉變機制的研究
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TG146.23

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國家自然科學基金


Effect of Strain Rate on Brittle-Ductile Transition Mechanism of the Ti45Al10Nb Alloy with Fully Lamellar Microstructure
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    摘要:

    研究了應變速率和溫度對Ｔｉ４５Ａｌ１０Ｎｂ合金的屈服強度和延伸率的影響。結果表明：隨著應經升高，合金的屈服強度升高而延伸率下降，由此得到韌脆溫度ＴＢＤＴ隨應變束率升高而升工計算出Ｔｉ４５Ａｌ１０Ｎｂ合金韌脆轉變的激活能為３３０ＫＪ／ｍｏｌ。這一數(shù)值與ｒ－ＴｉＡｌ合金中原子的自擴散激活能（２９０ＫＪ／ｍｏｌ）相當，說明Ｔｉ４５Ａｌ１０Ｎｂ合金韌脆轉變過程受擴散控制的形跡機制，即位錯攀移控制，ＴＥＭ形

    Abstract:

    The effects of strain rate and temperature on the tensile yield strength and elongation of titanium aluminides are studied. The alloy Ti 45Al 10Nb(at%) has a fully lamellar microstructure. The test results show that the brittle ductile transition(BDT) temperature increases with the increases of strain rate and temperature. The activation energy is 330kJ/mol, which approximates to the self diffusion activation energy of atoms in the TiAl alloy. Fractography and dislocation configuration analyses demonstrate that the brittle ductile transition of the alloy Ti 45Al 10Nb is controlled by dislocation climb.

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劉自成,Kinm, YW. T45Al10Nb附帶 金全片層組織韌脆轉變機制的研究[J].稀有金屬材料與工程,2000,(3):185~189.[Liu Zicheng, Zhang Weijiang, Li Shujiang, Chen Guoliang, Y. W. Kim . Effect of Strain Rate on Brittle-Ductile Transition Mechanism of the Ti45Al10Nb Alloy with Fully Lamellar Microstructure[J]. Rare Metal Materials and Engineering,2000,(3):185~189.]
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  • 最后修改日期:1999-07-29
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