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時效工藝對Ti1023合金微觀組織和力學性能的影響
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國家“973”項目（2007CB613804）；國家自然科學基金重點項目（50831004）和面上項目（50771080，50671077）


Influence of Aging Process on Microstructure and Mechanical Properties of Ti1023 Alloys
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    摘要:

    對比研究了直接時效和雙重時效對Ti-10V-2Fe-3Al合金微觀組織及力學性能的影響。結果顯示，在相同的時效時間下，雙重時效后試樣的屈服強度略低于直接時效，但雙重時效的延伸率遠遠高于直接時效。較之直接時效，雙重時效具有更好的強度塑性匹配。斷口分析表明，直接時效斷口為沿晶斷裂，高倍形貌顯示為晶界延性斷裂。而雙重時效斷口以穿晶韌窩為主。微觀組織觀察表明，雙重時效良好的強度塑性匹配源于α/β相間的片層組織，晶界α相薄膜的抑制及時效后初始β晶界、晶內(nèi)組織之間強度差的減少。

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    The influence of simplex aging and duplex aging on the microstructures and mechanical properties of Ti-10V-2Fe-3Al (Ti1023) alloys were investigated. Results show that for the same aging time, yield strength of duplex aged samples is slightly lower than that of simplex aged samples. However, elongation of duplex aged samples is significantly higher than that of simplex aged ones. Compared with the simplex aged samples, the better combination of strength and ductility occurs in duplex aged ones. SEM fractography of simplex aged samples shows intergranular fracture mode at lower magnification but grain boundary ductile fracture at higher magnification. However, for duplex aged samples, transgranular dimple fracture is dominant. Microstructure observations show that the good combination of strength and ductility of duplex aged samples is attributed to the microstructure of alternately arranged α/β plates, the suppression of continuous grain boundary α film and the decreased strength difference between the β aged matrix and the β grain boundary precipitate zone.

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陳 威,孫巧艷,肖 林,孫 軍,葛 鵬.時效工藝對Ti1023合金微觀組織和力學性能的影響[J].稀有金屬材料與工程,2011,40(4):708~713.[Chen Wei, Sun Qiaoyan, Xiao Lin, Sun Jun, Ge Peng. Influence of Aging Process on Microstructure and Mechanical Properties of Ti1023 Alloys[J]. Rare Metal Materials and Engineering,2011,40(4):708~713.]
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  • 收稿日期:2010-04-08
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