Fe_(50)Mn_(30)Co_(10)Cr_(10)高熵合金组织结构对其绝热剪切敏感性的影响
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摘要
在室温下利用分离式霍普金森压杆对Fe_(50)Mn_(30)Co_(10)Cr_(10)高熵合金帽型样进行动态加载,通过动态加载曲线对比及金相观察分析了不同组织结构对Fe_(50)Mn_(30)Co_(10)Cr_(10)高熵合金的绝热剪切敏感性的影响规律与机制。结果表明,在相同动态加载条件下,试样晶粒越小、密排六方(hcp)相含量越多,绝热剪切带形成时的应力坍陷时间、临界应变、单位体积绝热剪切吸收能越大,绝热剪切带的宽度越小,绝热剪切敏感性降低。以面心立方(fcc)相为基体的Fe_(50)Mn_(30)Co_(10)Cr_(10)高熵合金的晶粒越小、hcp相含量越多,其应变硬化效应和应变速率强化效应越大,在相同动态加载条件下绝热剪切敏感性越小。
Dynamic loading of Fe_(50)Mn_(30)Co_(10)Cr_(10) high-entropy alloy was carried out by using a split Hopkinson pressure bar at room temperature. The influence of different microstructures on the adiabatic shear susceptibility of Fe_(50)Mn_(30)Co_(10)Cr_(10) high-entropy alloy was analyzed by metallographic observation and comparison among the dynamic loading curves. The results showed that under the same dynamic loading conditions, the smaller grains and the more content of the hexagonal close-packed(HCP) phase in the sample led to an increase in the stress collapse time, the critical strain, and the adiabatic shear absorption energy per unit volume, as well as the decrease in the width of the adiabatic shear band and the adiabatic shear susceptibility. Besides, for the Fe_(50)Mn_(30)Co_(10)Cr_(10) high-entropy alloy with face-centered cubic(FCC) structure as the matrix, the smaller grain size and the higher HCP phase content led to both the strain hardening effect and strain rate strengthening effect increased, while the adiabatic shear susceptibility reduced under the same dynamic loading conditions.
Dynamic loading of Fe_(50)Mn_(30)Co_(10)Cr_(10) high-entropy alloy was carried out by using a split Hopkinson pressure bar at room temperature. The influence of different microstructures on the adiabatic shear susceptibility of Fe_(50)Mn_(30)Co_(10)Cr_(10) high-entropy alloy was analyzed by metallographic observation and comparison among the dynamic loading curves. The results showed that under the same dynamic loading conditions, the smaller grains and the more content of the hexagonal close-packed(HCP) phase in the sample led to an increase in the stress collapse time, the critical strain, and the adiabatic shear absorption energy per unit volume, as well as the decrease in the width of the adiabatic shear band and the adiabatic shear susceptibility. Besides, for the Fe_(50)Mn_(30)Co_(10)Cr_(10) high-entropy alloy with face-centered cubic(FCC) structure as the matrix, the smaller grain size and the higher HCP phase content led to both the strain hardening effect and strain rate strengthening effect increased, while the adiabatic shear susceptibility reduced under the same dynamic loading conditions.
引文
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[3] Zaddach A J,Niu C,Koch C C,et al.Mechanical Properties and Stacking FaultEnergies of NiFeCrCoMn High-Entropy Alloy[J].JOM,2013,65(12):1780-1789.
[4] Tong C J,Chen Y L,Yeh J W,et al.Microstructure characterization of Alx CoCrCuFeNi high-entropy alloy system with multiprincipal elements[J].Metallurgical & Materials Transactions A,2005,36(4):881-893.
[5] YEH J W.Alloy Design Strategies and Future Trends in High-Entropy Alloys[J].JOM,2013,65(12):1759-1771.
[6] Zhang Y,Peng W J.Microstructural control and properties optimization ofhighentropy alloys[J].Procedia Engineering,2012,27:1169-1178.
[7] Li Z M,Pradeep K G,Deng Y,et al.Metastable high-entropy dual-phase alloys overcome the strength-ductility trade-off[J].Nature,2016,534:227-230.
[8] 杨扬,王君良.晶界特征分布对1Cr18Ni9Ti奥氏体不锈钢绝热剪切带自组织的影响[J].矿冶工程,2018,38(4):130-133.
[9] 刘岚逸,汪冰峰,张晓泳.TC18钛合金中剪切局域化及其微观结构研究[J].矿冶工程,2018,38(4):149-151.
[10] Yang Y,Wang B F.Dynamic recrystallization in adiabatic shear band in α-titanium[J].Journal of Materials Letters,2006,60(17-18):2198-2202.
[11] Li Z M,Tasan C C,Pradeep K G,et al.A TRIP-assisted dual-phase high-entropy alloy:Grain size and phase fraction effects on deformation behavior[J].Acta Materialia,2017,131:323-335.
[12] Guo Y Z,Li Y L,Pan Z,et al.A numerical study of microstructure effect on adiabatic shear instability:Application to nanostructured/ultrafine grained materials[J].Mechanics of Materials,2010,42(11):1020-1029.