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TC18鈦合金的微觀組織和力學性能
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臺州學院機械學院,上海交通大學

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浙江省教育廳科研項目 (No. Y201533396)


Microtructure and mechanical properties of TC18 Titanium alloy
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School of MechanicalSEngineering,STaizhouSUniversity,State key laboratory of Metal Matrix Composites,Shanghai Jiao Tong University

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Research program of Zhejiang Education Department (No. Y201533396)

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    摘要:

    本研究使用真空自耗爐制備出Ti-5Al-5Mo-5V-1Fe-1Cr鈦合金，然后進行了熱機加工和熱處理。本文對熱處理后材料的微觀組織和力學性能進行了研究。熱處理后，初生α相呈現(xiàn)出球形、近似等軸、盤狀以及短棒狀等多種形貌，這和α的晶界偏析有關(guān)。拉伸試驗中試樣表現(xiàn)出了良好的強度和塑性，不過材料的屈強比值卻高達0.95。這說明拉伸過程中試樣位錯強化增長相對緩慢。研究認為拉伸過程中晶界吸收了增殖的位錯，這是導致材料高屈強比的首要原因。

    Abstract:

    Ti-5Al-5Mo-5V-1Fe-1Cr Ti alloy is fabricated via consumable vacuum arc-remelting furnace in this work, and then is subjected to thermo-mechanical processing and heat treatment. The microstructural characteristics and tensile properties of the heat-treated material are investigated. Primary α dispersing in β phase shows as spheroidization, near equiaxed, plate-shaped and rod-shaped after heat treatment. This is associated with boundary segregation of α grain. The material has a good combination of strength and plasticity during tensile test. However, the value of σy /σb of the material reaches 0.95. It is suggested that the grain boundary absorb dislocations during tensile test. Therefore, the dislocation strengthening increases very slowly. This is the primary reason for the material to obtain high value of σy /σb.

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孫曙宇,呂維潔. TC18鈦合金的微觀組織和力學性能[J].稀有金屬材料與工程,2016,45(5):1138~1141.[Sun Shuyu, Lu Weijie. Microtructure and mechanical properties of TC18 Titanium alloy[J]. Rare Metal Materials and Engineering,2016,45(5):1138~1141.]
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  • 收稿日期:2015-04-19
  • 最后修改日期:2015-10-08
  • 錄用日期:2015-11-18
  • 在線發(fā)布日期: 2016-06-02
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