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98255 MECHANISM OF LIQUID METAL EMBRITTLEMENT FOR ALUMINIUM IN Hg+3at%Ga

Picture for 98255 MECHANISM OF LIQUID METAL EMBRITTLEMENT
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Product Number: 51300-98255-SG
ISBN: 98255 1998 CP
Author: Yan-Jing Su, Yan-Bin Wang, Wu-Yang Chu, C.-M. Hsiao
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Using a special TEM constant deflection device, the change in dislocation configuration ahead of a loaded crack tip before and after adsorbing of Hg atoms and the initiation of liquid metal-induced nanocrack (LMIC) has been observed. The results shown that chemisorption of Hg atoms could facilitate dislocation emission, multiplication and motion. Nanocracks will initiate in dislocation free zone (DFZ) or at the crack tip when chemisorption-facilitiated dislocation emission, multiplication and motion reach a critical condition. On the basis of the available experimental evidence concerning liquid metal embrittlement (LME), a new mechanism for this phenomenon is considered. This involves the decrease in surface energy induced by chemisorption of Hg atoms results in a reduction in the critical stress intensity factors for dislocation emission and the resistance for dislocation motion. On the other hand, the plastic work and the K... Keywords: liquid metal embrittlement, aluminum, mercury, TEM, dislocation
Using a special TEM constant deflection device, the change in dislocation configuration ahead of a loaded crack tip before and after adsorbing of Hg atoms and the initiation of liquid metal-induced nanocrack (LMIC) has been observed. The results shown that chemisorption of Hg atoms could facilitate dislocation emission, multiplication and motion. Nanocracks will initiate in dislocation free zone (DFZ) or at the crack tip when chemisorption-facilitiated dislocation emission, multiplication and motion reach a critical condition. On the basis of the available experimental evidence concerning liquid metal embrittlement (LME), a new mechanism for this phenomenon is considered. This involves the decrease in surface energy induced by chemisorption of Hg atoms results in a reduction in the critical stress intensity factors for dislocation emission and the resistance for dislocation motion. On the other hand, the plastic work and the K... Keywords: liquid metal embrittlement, aluminum, mercury, TEM, dislocation
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