Unraveling the formation mechanism of abnormally large grains in an advanced polycrystalline nickel base superalloy

The formation of abnormally large grains (ALGs) is detrimental for the mechanical properties in the powder metallurgy nickel base superalloy. Understanding the underpinning mechanism of inducing ALGs remains to be significant to control the grain size development and improve the in-service performance. In this article, a gradient distribution of grain size is introduced within an individual specimen via isothermal compression, and subsequently...