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溫度及加載速率對U-5.7%Nb合金變形行為的影響
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中國工程物理研究院科學(xué)發(fā)展基金 (2012B0301044, 2014B0301046)


Influence of Temperature and Loading Rates on Deformation Behaviors
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    摘要:

    研究了淬火和時效2種狀態(tài)的U-5.7%Nb合金，從室溫（20 ℃）~800 ℃溫度范圍的準(zhǔn)靜態(tài)拉伸性能，及合金的變形和斷裂行為。結(jié)果表明，不論淬火或時效狀態(tài)的U-5.7%Nb合金，當(dāng)溫度高于200 ℃后，合金在室溫下表現(xiàn)出的二次屈服現(xiàn)象將完全消失，并在400 ℃溫度附近發(fā)生脆化，在700 ℃溫度附近表現(xiàn)出明顯的超塑性，其中淬火態(tài)合金性能的變化尤為明顯。并對準(zhǔn)靜態(tài)拉伸、Hopkinson拉伸及爆炸膨脹環(huán)3種加載速率下，時效態(tài)U-5.7%Nb合金的組織結(jié)構(gòu)進(jìn)行了對比分析。結(jié)果表明，以不同應(yīng)變速率斷裂的時效態(tài)U-5.7%Nb合金，斷口中心部位的韌窩比邊緣部位相對明顯，Hopkinson拉伸斷口的晶粒大于準(zhǔn)靜態(tài)拉伸斷口的晶粒，爆炸速率斷裂的合金斷口有剪切斷裂、邊緣開裂及局部夾雜脫落的現(xiàn)象

    Abstract:

    Quasi-static tensile properties, deformation and fracture behaviors of both quenched and aged U-5.7%Nb alloys in a temperature range from room temperature to 800 oC were investigated. The results show that the second yield phenomenon of both quenched and aged U-5.7%Nb alloys occurring at room temperature disappeared at a temperature higher than 200 oC, and the embrittlement behaviors of two alloys appeared at 400 oC. Meanwhile, the superplasticity has been observed in two alloys at the temperature higher than 700 oC, and the superplasticity of the quenched alloys was more evident than that of the aged alloys. The microstructures of the aged U-5.7%Nb deformed at quasi-static tension, Hopkinson tension and expansion loadings have been analyzed. The results indicate that the dimples at the center zone of the specimens were more obvious than that at the rim zone in aged U-5.7%Nb alloys fractured at different strain rates. And the grains at the fracture of Hopkinson tension were larger than that of the quasi-static loading. Shear fracture, rim cracking and inclusion falling off were observed in the fracture of the alloys deformed at expansion loading

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邱志聰,何立峰,肖大武,鄒東利,楊江榮.溫度及加載速率對U-5.7%Nb合金變形行為的影響[J].稀有金屬材料與工程,2014,43(11):2829~2835.[Qiu Zhicong, He Lifeng, Xiao Dawu, Zou Dongli, Yang Jiangrong. Influence of Temperature and Loading Rates on Deformation Behaviors[J]. Rare Metal Materials and Engineering,2014,43(11):2829~2835.]
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  • 收稿日期:2013-11-15
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  • 在線發(fā)布日期: 2015-04-07
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