摘要
通过高温压缩试验,研究了Zr_(57)Cu_(15. 4)Ni_(12. 6)Al_(10)Nb_5非晶合金在温度为411～461℃,应变速率为0. 0005～0. 1 s-1条件下温度和应变速率对流变应力的影响,并分析了应变速率敏感系数随温度和应变速率的变化趋势。运用示差扫描量热法(DSC)确定合金在各温度下的可加工时间,根据试验数据绘制出真实应力-应变曲线,计算得到应变速率敏感性指数,并利用X射线衍射(XRD)分析了热压后样品的组织。结果表明:合金在热压过程中的流变应力与温度负相关,与应变速率正相关,且符合"自由体积"理论。经过热压后的样品组织基本保持了非晶态。当温度为446～456℃、应变速率为0. 001～0. 01 s-1时,应变速率敏感性指数约等于1,可作为Zr57Cu15. 4Ni12. 6Al10Nb5非晶合金在过冷液相区的最佳成形条件。
The effect of deformation temperature and strain rate on flow stress of Zr57Cu15.4Ni12.6Al10Nb5 amorphous alloy was investigated via high temperature compression tests at 411-461℃with strain rate of 0.0005-0.1 s-1,and the trend of strain rate sensitivity coefficient with temperature and strain rate was analyzed.Processing time for the compression tests at various temperatures was determined by using differential scanning calorimeter(DSC).The true stress-strain plots were obtained according to test data,from which the strain rate sensitivity index was calculated.Microstructure of samples after high temperature compression was analyzed by X-ray diffraction(XRD).The results indicate that the flow stress is negatively correlated with temperature and positively correlated with strain rate during high temperature compression,which agrees with the‘free volume’theory.The microstructure remains amorphous after high temperature compression.when temperature is 446-456℃,and strain rate is 0.001-0.01 s-1,the strain rate sensitivity index is approximately equal to 1,which can be used as the best forming condition of the Zr57 Cu15.4 Ni12.6 Al10 Nb5 amorphous alloy in supercooled liquid region.
作者
陆洲
胡会娥
苏小红
LU Zhou;HU Hui-e;SU Xiao-hong(Department of Basic,Naval University of Engineering,Wuhan 430033,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2019年第2期287-292,共6页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51575522)
海军工程大学基础部科研基金资助项目(HGDJCB17ZK008)
