Problems that porosity may cause?

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I understand the different ways that pores may be formed in a metal, however what i want to know is how it affects the properties of the metal. Am i right in thinking that it would increase the fatigue of the metal, since a large scale of porosity would make the metal more prone to crack formation?
 
Well it usually affects the material strength of the metal. It is known to weaken the metal but it has also been looked into as a way to strengthen the metal as well.
 

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