1. Please explain why micro-segregation and macro-segregation happen during prac
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1. Please explain why micro-segregation and macro-segregation happen during practical solidification. (10 pts) For materials science, the essential point is to figure out an effective way to increase materials strength without significantly compromising ductility. When we learned precipitation strengthening, we knew that, for a given amount of an alloying element, fine and uniform-distributed precipitates generated by the alloying element are more efficient in aging treatment of Al alloys, the questions for you areExplanation / Answer
Macro-segragation is the solidification that occurs during solidification primarily due to the lack of weld pool mixing by convenction during fusion welding of dissimilar alloys or metals. and it can be avoided by
Stirring the liquid weld poolby either applying the magnetic field or any other way in order to give better mixing in the weld pool and also for deeper penetration and mixing a gas tungsten arc wlding process is used.
On the other hand Micro-Segregation is localized composition with variation in scale smaller than crystal size which is also known as coring which is caused by dendritic freezing in alloys.
- The original dendrite arm which shoot out in liquid metal, freeze as relatively as pure metal.
- Also rapid solidification can reduce segregation in micro.
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