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液态金属脆化(LME)

1930
  • Adolph S. Rehbinder
Materials scientist analyzing metal fracture due to liquid metal embrittlement in a laboratory.

(图片仅供参考)

Liquid metal embrittlement is a phenomenon where a normally ductile solid metal experiences a severe loss of ductility and fails in a brittle manner when wetted by a specific liquid metal while under tensile 压力. The failure is often catastrophic and rapid. The mechanism involves the liquid metal atoms adsorbing at a crack tip, which reduces the cohesive strength of the solid’s atomic bonds.

For LME to occur, several conditions must be met: the presence of a tensile stress, intimate contact between the solid and liquid metals, and a specific metallurgical pairing. A classic and dramatic example is the embrittlement of aluminum by liquid gallium. A small drop of gallium on an aluminum part under stress can cause it to fracture almost instantly. The technical novelty of understanding LME was the recognition that fracture could be driven by a surface energy phenomenon rather than bulk material properties alone. The liquid metal atoms effectively ‘unzip’ the atomic bonds at the crack tip by lowering the energy required for crack propagation.

液态金属微环境 (LME) 的严重程度取决于温度、应力水平以及特定的固液金属对等因素。两种金属之间的溶解度是一个关键因素;互溶度低的系统通常极易受到影响。历史上,镀锌钢框架等结构中的意外故障,或水银温度计部件的破裂,后来都被归咎于 LME。这些知识成为工程设计中材料选择和兼容性评估的基础,尤其是在航空航天和核能领域,因为这些领域中的异种金属通常彼此靠近。

UNESCO Nomenclature: 3308
– Materials science

类型

Physical Process

中断

重大的

用法

广泛使用

前体

  • 托马斯·杨关于表面张力和内聚力的研究
  • 乔赛亚·威拉德·吉布斯对热力学和界面能概念的发展
  • 了解金属键合和晶体结构
  • 热浸镀锌和焊接等工业实践创造了观察效果的机会

应用程序

  • 设计指南,以避免高温应用(例如热交换器)中易受影响的金属对之间的接触
  • 使用熔融金属的行业(例如焊接、钎焊和镀锌)的故障分析
  • 了解使用液态金属冷却剂的核反应堆的安全风险
  • 用于材料回收或拆除的受控断裂应用

专利:

NA

潜在创新理念

  • lme-based ‘demolition paint’ for controlled deconstruction of metal structures
  • 使用封装的lme剂进行安全数据处理的自毁电子元件
  • 先进的焊料,集成抑制剂元素,可防止周围元件发生熔化
  • 激光辅助加工用于在难切削合金中创建复杂的微特征
  • 使用 LME 轻松分离复杂合金成分的回收工艺
  • 智能结构健康监测系统,可检测脆化液态金属的存在
  • protective coatings with chemical barriers that are inert to common liquid metal embrittlers
  • 3D打印技术,将固体基质和封装的液态金属共沉积,以创建具有可编程断裂路径的材料
  • 基于 lme 的执行器,在达到特定温度时触发机械响应
  • 用于快速识别 LME 现场故障原因的法医工程套件
Related to: liquid metal embrittlement, lme, brittle fracture, gallium, aluminum, mercury, stress corrosion, metallurgy, interfacial energy, adsorption.

历史背景

液态金属脆化(LME)

1922
1925-01-01
1930
1930
1930
1930
1934
1922
1924
1927
1930
1930
1930
1930
1940

(如果日期未知或不相关,例如“流体力学”,则提供其显著出现的近似估计)

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