论文标题
间质分离有可能减轻铁中的液态金属含量
Interstitial segregation has the potential to mitigate liquid metal embrittlement in iron
论文作者
论文摘要
液体金属对金属合金的含量会导致灾难性的物质故障，并严重影响其结构完整性。人们认为，液态金属和固体隔离之前的晶界弱化会促进早期断裂。然而，尚不清楚在凝聚力增强的间质溶质和拥抱晶粒边界腐烂的元素之间平衡的潜力。在这里，我们揭示了如何在$σ5\，[0 \，0 \，1] $ tilt Grain Bouncor中以$α-$ fe（$ 4〜 $ 4〜AT。at。at。at。at。at。\％$ al）中硼族隔离如何减轻Prime Embrittler Zinc的有害影响。锌形成纳米级隔离模式在结构和组成上复杂的晶界状态。 Ab-Initio模拟表明，硼会阻碍锌的分离，并补偿锌诱导的晶界内聚力损失。我们的作品为间隙溶质如何密切修改晶粒边界提供了新的启示，从而开辟了将其用作预防灾难性物质故障的掺杂剂的途径。
The embrittlement of metallic alloys by liquid metals leads to catastrophic material failure and severely impacts their structural integrity. The weakening of grain boundaries by the ingress of liquid metal and preceding segregation in the solid are thought to promote early fracture. However, the potential of balancing between the segregation of cohesion-enhancing interstitial solutes and embrittling elements inducing grain boundary decohesion is not understood. Here, we unveil the mechanisms of how boron segregation mitigates the detrimental effects of the prime embrittler, zinc, in a $Σ5\,[0\,0\,1]$ tilt grain boundary in $α-$Fe ($4~at.\%$ Al). Zinc forms nanoscale segregation patterns inducing structurally and compositionally complex grain boundary states. Ab-initio simulations reveal that boron hinders zinc segregation and compensates for the zinc induced loss in grain boundary cohesion. Our work sheds new light on how interstitial solutes intimately modify grain boundaries, thereby opening pathways to use them as dopants for preventing disastrous material failure.
