THE reduction in ductility and fracture stress of many metals tested in certain liquid metal envi-ronments is generally known as liquid metal embrittlement（LME）.The resistance to fractureR=（1-v<sup>2</sup&...THE reduction in ductility and fracture stress of many metals tested in certain liquid metal envi-ronments is generally known as liquid metal embrittlement（LME）.The resistance to fractureR=（1-v<sup>2</sup>）K<sub>IC</sub><sup>2</sup>（L）/E,calculated by the fracture toughness K<sub>IC</sub>（L）in LME,is often 1—3orders of magnitude greater than the surface energy of the material,γ.Orowan’s equationof R=2γ<sub>eff</sub>=γ+γ<sub>P</sub> must be used in considering LME rather than Griffith’s equation of R=2γ,where γ<sub>P</sub> is plastic work done.The experiments in LME showed that γ<sub>P</sub>=（10—1 000）γ.It has been shown that there is localized plastic deformation in brittle failure induced bythe chemisorption of liquid metal.展开更多
文摘THE reduction in ductility and fracture stress of many metals tested in certain liquid metal envi-ronments is generally known as liquid metal embrittlement（LME）.The resistance to fractureR=（1-v<sup>2</sup>）K<sub>IC</sub><sup>2</sup>（L）/E,calculated by the fracture toughness K<sub>IC</sub>（L）in LME,is often 1—3orders of magnitude greater than the surface energy of the material,γ.Orowan’s equationof R=2γ<sub>eff</sub>=γ+γ<sub>P</sub> must be used in considering LME rather than Griffith’s equation of R=2γ,where γ<sub>P</sub> is plastic work done.The experiments in LME showed that γ<sub>P</sub>=（10—1 000）γ.It has been shown that there is localized plastic deformation in brittle failure induced bythe chemisorption of liquid metal.
