论文标题
边缘脱位可以控制难治性身体中心地带高熵合金中的屈服强度
Edge Dislocations Can Control Yield Strength in Refractory Body-Centered-Cubic High Entropy Alloys
论文作者
论文摘要
能源效率正在激励人们寻找新的高温金属。基于难治性元素（CR-MO-NB-TA-V-W-HF-TI-TI-ZR）的一些新的以身体为中心的立方体随机多组分“高熵合金（HEAS）”在高温下具有出色的强度，但这种出色行为的物理起源却尚不清楚。在这里，我们使用集成的中子 - 划分（ND），高分辨率透射电子显微镜（HRTEM）和理论表明，NBTAVTI合金的高强度和强度保留和新的高强度/低密度/低密度CRMONBV合金可归因于边缘错位。这是令人惊讶的，因为BCC元素金属中的塑料流和稀合金被普遍接受为螺钉位错控制。我们使用洞察力和理论在$ 10^7 $ bcc heas上进行计算指导的搜索，并确定$ 10^6 $超过$ 10^6 $可能的超强高温合金组成，以供将来的探索。
Energy efficiency is motivating the search for new high-temperature metals. Some new body-centered-cubic random multicomponent "high entropy alloys (HEAs)" based on refractory elements (Cr-Mo-Nb-Ta-V-W-Hf-Ti-Zr) possess exceptional strengths at high temperatures but the physical origins of this outstanding behavior are not known. Here we show, using integrated neutron-diffraction (ND), high-resolution transmission electron microscopy (HRTEM), and theory, that the high strength and strength retention of a NbTaVTi alloy and a new high-strength/low-density CrMoNbV alloy are attributable to edge dislocations. This is surprising because plastic-flow in BCC elemental metals and dilute alloys is universally accepted to be controlled by screw dislocations. We use the insight and theory to perform a computationally-guided search over $10^7$ BCC HEAs and identify over $10^6$ possible ultra-strong high-temperature alloy compositions for future exploration.
