Crack growth behavior of a high strength aluminum alloy during LME by gallium
Crack growth behavior of a high strength aluminum alloy during LME by gallium
复制标题
镓在 LME 过程中高强度铝合金的裂纹扩展行为
DOI：
10.1016/0036-9748(89)90487-0
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
R. Hoagland
中科院分区：
文献类型：
--
作者：
B. Benson;R. Hoagland
液态金属脆化（LME）是在一些正常延展性金属中当受到应力并且与某些液态金属紧密接触时观察到的脆性断裂行为。这种形式的环境脆化被认为是由于裂纹尖端的固体原子和吸附的液体金属原子之间的相互作用，这改变了尖端固体金属原子之间的力关系[1]。已知液态镓在多晶铝中诱导两种类型的脆性断裂：沿晶断裂和穿晶解理断裂。这两种类型的脆化导致断裂在应力强度水平下扩展，远低于材料在空气中的断裂韧性。解理断裂，由于其丰富的滑移系，通常与fcc晶体无关，发生在{100}面上，并且主要在脆化的铝单晶中观察到，[2]。这表明裂纹尖端的局部相互作用导致固体金属原子之间的键强度降低。
Liquid Metal Embrittlement,(LME), is the brittle fracture behavior observed in some normally ductile metals when stressed and in intimate contact with some liquid metals. This form of environmental embrittlement is thought to result from interactions at a crack tip between atoms of the solid and adsorbed liquid metal atoms which alter the force relations between the solid metal atoms at the tip,[1]. Liquid gallium is known to induce two types of brittle fracture in polycrystalline aluminum; intergranular fracture and transgranular cleavage fracture. Both types of embrittlement result in the propagation of fracture at stress intensity levels much below the fracture toughness of the material in air.Cleavage fracture, not generally associated with fcc crystals due to their abundant slip systems, occurs on {100} planes, and has been observed mainly in embrittled single crystals of aluminum,[2]. This suggests local interactions at the crack tip resulting in a reduction in strength of the bonds between solid metal atoms.