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What are the defects of Aluminum?

What are the defects of Aluminum?
Engineering   Mechanical-Engineering   
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Answer #1

Some forms of delaminations in low alloy aluminum are traceable to:

Hydrogen Pickup(blisters),extra large grain size,casting defects,and surface to center"smearing "(where lubricant can cause more rapid metal flow than center).The last problem may occur in hammer forging,but is unlikely in press forgings.

ATMOSPHERE BLISTERS:caused by exposure to combustion byproducts

OIL/LUBE BLISTERS: caused by metal flow variation between center and surface

FLOW THROUGH DEFECTS: metal flow from centrally located details ,and flowing beneath surrounding bosses or ribs.

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