肖大武,何立峰,邱志聪,邹东利.温度对U-5.7Nb合金动态压缩力学性能影响研究[J].稀有金属材料与工程,2018,47(1):363~366.[Xiao Dawu,He Lifeng,Qiu Zhicong,Zou Dongli.Dynamic Compression Behavior of U-5.7Nb Alloy at Elevated Temperatures[J].Rare Metal Materials and Engineering,2018,47(1):363~366.]
温度对U-5.7Nb合金动态压缩力学性能影响研究
投稿时间:2015-10-13  修订日期:2015-11-26
中文关键词:  U-5.7Nb合金  温度  应变率  动态压缩
基金项目:国防科技重点实验室基金(项目号9140C660201140C66275),中物院科学发展基金资助(项目号2014B0301046, 2015B0301066)
中文摘要:
      利用Hopkinson杆装置开展了-100℃~400℃较宽温度范围下U-5.7Nb合金的动态压缩变形行为,研究结果表明U-5.7Nb合金的压缩性能对温度和应变率较为敏感。随实验温度升高,屈服应力迅速下降,下降速率约为2MPa/℃,而加工硬化行为基本不变,当温度升高至200℃以上时,静动态应力~应变曲线形态由“双屈服”转变为“单屈服”;随应变率提高,屈服应力及去孪生引起的硬化模量均明显增大。最后,结合金相分析结果讨论了400℃时静动态力学曲线分歧的来源。
Dynamic Compression Behavior of U-5.7Nb Alloy at Elevated Temperatures
英文关键词:U-5.7Nb alloy  temperature  strain rate  dynamic compression
英文摘要:
      High strain rate compression experiments of U-5.7Nb alloy were conducted at temperatures from -100℃ to 400℃ with split Hopkinson pressure bar apparatus. Results show that the compressive stress-strain response depends sensitively on the applied strain rate and test temperature. The yield stress of U-5.7Nb alloy was found to decreased rapidly with the increasing temperature at a rate of about 2MPa/℃, while the work hardening rate was relatively constant. At temperatures higher than 200℃,the shape of the stress~strain curves changed from duplex yield character to elastic-plastic character for both quasi-static and dynamic compression experiments. The hardening modulus caused by detwinning and the yield stress increased obviously with the increasing strain rates. Finally,the divergency of the low- and high-rate deformation curves at temperature of 400℃ was discussed based on the optical micrography.
作者单位E-mail
肖大武 中国工程物理研究院材料研究所 hopkinson@163.com 
何立峰 中国工程物理研究院材料研究所  
邱志聪 中国工程物理研究院材料研究所  
邹东利 中国工程物理研究院材料研究所  
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