Room- and cryogenic-temperature compressive properties for the three V₁₀Cr₁₀Co₃₀Fe_xNi_50-x (x = 40, 45, 50) high entropy alloys are investigated under quasi-static and dynamic loading conditions. The face-centered cubic (FCC) stability, which is estimated by the calculation of Gibbs free energy difference between FCC and body-centered cubic (BCC) phases, decreases in increasing order of Fe content. The 40Fe and 45Fe alloys consist of FCC single phase, whereas the 50Fe alloy is composed of a duplex structure with ~95 vol% of body-centered cubic (BCC) lath martensite. Under the quasi-static loading condition at room temperature, the dislocation slip prevails in the 40-at.%-Fe-containing alloy, while the twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP) are activated in the other alloys. The decrease in testing temperature lowers the FCC stability, activating both TWIP and TRIP mode. Under the dynamic loading, the magnitude of TWIP effect enhances, but that of TRIP effect reduces in comparison to the quasi-static loading. The adiabatic heating induced from the dynamic loading increases the FCC stability, thereby resulting in the reduced TRIP effect. Despite the increased stability, the TWIP occurs more actively because the dynamic loading enables the increased flow stress to readily exceed the critical stress required for TWIP. These variations of deformation mechanisms according to the FCC stability, testing temperature, loading rate, adiabatic heating effect, and increased flow stress effect are systematically correlated by the shifting of stability on the slip-TWIP-TRIP mechanism band.

三种V ₁₀ Cr ₁₀ Co ₃₀ Fe _x Ni _50-x的室温和低温压缩特性在准静态和动态载荷条件下研究了（x = 40、45、50）高熵合金。通过计算FCC和体心立方（BCC）相之间的吉布斯自由能差来估算面心立方（FCC）稳定性，其铁含量的增加顺序减小。40Fe和45Fe合金由FCC单相组成，而50Fe合金由双相结构组成，其体心立方（BCC）板条马氏体含量约为95％。在室温下的准静态载荷条件下，位错滑移在含40at。％Fe的合金中普遍存在，而孪晶诱导塑性（TWIP）和相变诱导塑性（TRIP）则被激活。合金。测试温度的降低会降低FCC的稳定性，同时激活TWIP和TRIP模式。在动态加载下 与准静态载荷相比，TWIP效应的幅度增强，而TRIP效应的幅度减小。动态载荷引起的绝热加热增加了FCC的稳定性，从而降低了TRIP效应。尽管增加了稳定性，但由于动态载荷使增加的流动应力容易超过TWIP所需的临界应力，因此TWIP发生得更加活跃。根据FCC稳定性，测试温度，加载速率，绝热加热效应和增加的流动应力效应，变形机制的这些变化通过滑移TWIP-TRIP机制带上的稳定性转移而系统地相关。动态载荷引起的绝热加热增加了FCC的稳定性，从而降低了TRIP效应。尽管增加了稳定性，但由于动态载荷使增加的流动应力容易超过TWIP所需的临界应力，因此TWIP发生得更加活跃。根据FCC稳定性，测试温度，加载速率，绝热加热效应和增加的流动应力效应，变形机制的这些变化通过滑移TWIP-TRIP机制带上的稳定性转移而系统地相关。动态载荷引起的绝热加热增加了FCC的稳定性，从而降低了TRIP效应。尽管增加了稳定性，但由于动态载荷使增加的流动应力容易超过TWIP所需的临界应力，因此TWIP发生得更加活跃。根据FCC稳定性，测试温度，加载速率，绝热加热效应和增加的流动应力效应，变形机制的这些变化通过滑移TWIP-TRIP机制带上的稳定性转移而系统地相关。