liquid-metal-embrittlement-lmeabout 0.5 mmCrack that is severalcentimeters long andseveral mm deepCross-section of crack areaIntercrystalline crack,mostly filled with silver Silver solder dropNi-basedforgedalloySilver drop falls onto adisk that is under tensilestress Schematic vacuum ovenGraphite insulating matsLiquid Metal Embrittlement (LME) can lead to crackingand weakening of parts made from superalloys.Formation of "flowerets" on the opened grain boundaries; typical of LME0.02 mm0.1 mmSilver solder dropThere is a drop of silver solder at themouth of the crack Temperatureabout 800°C