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Effects of Microstructural Factors on Adiabatic Shear Behaviors of Ti6441 Alloys
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Effects of Microstructural Factors on Adiabatic Shear Behaviors of Ti6441 Alloys
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    摘要:

    針對Ti-6Al-4V-4Zr-Mo(Ti6441)合金采用不同的熱處理工藝得到等軸和片層2種微觀組織，使用分離式Hopkinson Bar技術(shù)對2種組織的試樣進行動態(tài)剪切試驗，研究微觀組織對該合金絕熱剪切敏感性的影響。結(jié)果表明：相同加載條件下，片層組織絕熱剪切敏感性較等軸組織低；2種組織動態(tài)強度接近，但片層組織較等軸組織具有更好的動態(tài)延展性；片層組織試樣中的絕熱剪切帶出現(xiàn)分叉現(xiàn)象，從而可以消耗更多的變形能。

    Abstract:

    In term of newly developed titanium alloys Ti-6Al-4V-4Zr-Mo (Ti6441) modified from the commercial Ti-6Al-4V alloys, the adiabatic shear behaviors of equiaxed and lamellar microstructures were investigated. Unlike the Ti-6Al-4V alloys, Ti6441 alloys with the lamellar microstructure are less susceptive to adiabatic shear bands (ASBs), compared with the equiaxed one. In particular, the ASBs branch off in the lamellar microstructure, requiring additional energy by consuming metal bulk plastic deformation work. Besides, forced shearing experiment results show the lamellar microstructure exhibits outstanding dynamic ductility in contrast with the equiaxed one, though both microstructures perform the same strength value.

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李建崇,南 海,趙嘉琪,黃 東,李樹奎,范群波,霍咚梅. Effects of Microstructural Factors on Adiabatic Shear Behaviors of Ti6441 Alloys[J].稀有金屬材料與工程,2013,42(6):1105~1107.[Li Jianchong, Nan Hai, Zhao Jiaqi, Huang Dong, Li Shukui, Fan Qunbo, Huo Dongmei. Effects of Microstructural Factors on Adiabatic Shear Behaviors of Ti6441 Alloys[J]. Rare Metal Materials and Engineering,2013,42(6):1105~1107.]
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  • 收稿日期:2012-06-25
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