Theoretical predication of dislocation-included high-temperature deformation mechanism maps for GH4742 alloy

ABSTRACT

Based on high-temperature compression tests and focusing on the mechanical behaviour characteristics and microstructure evolution laws during high-temperature compression, laws relating to the strain-rate sensitivity index m and the activation energy of deformation Q-value at varying strain rates and deformation temperatures are clarified. Deformation mechanism maps involving dislocation quantity are plotted. Dislocation evolution laws and deformation mechanisms of the grain size with Burgers vector compensation, and the flow stress with modulus compensation during high-temperature deformation are predicted using the deformation mechanism maps.

KEYWORDS:

• Metals and alloys
• microstructure
• high-temperature deformation
• strain-rate sensitivity index
• deformation mechanism maps

Disclosure statement

No potential conflict of interest was reported by the author(s).