Abstract Achieving reliable metallic bonding directly between steel and aluminum alloys has a broad societal impact on sustainability from transportation systems to space exploration and biomedical devices. This is because steel and aluminum alloys are the top two most available and widely used metals. However, the development of detrimental intermetallic compounds (IMCs) at the Al-Fe interface has frustrated researchers and engineers for decades. Here, we present a new mechanism on how a nanoscale amorphous layer can be introduced at the Al-Fe interface without undesirable IMC: (i) a rapid sliding at the Al-Fe interface can generate a nanoscale premelting layer, leading to nanoscale shear localization; (ii) the resulting high shear strain rate within the premelting layer is high enough to suppress crystallization; (iii) as long as sufficiently high shear strain rate can be sustained within the premelting layer until the interfacial temperature is low enough, a stable amorphous can be retained without relying on rapid solidification. The findings provide a mechanistic basis for devising novel alloy amorphization and dissimilar metal joining techniques.

中文翻译：

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通过 Al-Fe 界面处的纳米级剪切定位进行合金非晶化

摘要 直接在钢和铝合金之间实现可靠的金属结合对从运输系统到太空探索和生物医学设备的可持续性具有广泛的社会影响。这是因为钢和铝合金是最容易获得和使用最广泛的两种金属。然而，几十年来，Al-Fe 界面处有害金属间化合物 (IMC) 的发展使研究人员和工程师感到沮丧。在这里，我们提出了一种关于如何在 Al-Fe 界面引入纳米级非晶层而不产生不良 IMC 的新机制：（i）Al-Fe 界面处的快速滑动可以产生纳米级预熔层，导致纳米级剪切局部化; (ii) 在预熔层内产生的高剪切应变率足以抑制结晶；(iii) 只要在预熔层内能够维持足够高的剪切应变率直到界面温度足够低，就可以保持稳定的非晶态而不依赖于快速凝固。这些发现为设计新型合金非晶化和异种金属连接技术提供了机械基础。