Microstructural Evolution in cryomilled Inconel 625 Academic Article

abstract

• ABSTRACTNanocrystalline Inconel 625 alloy, with a uniform distribution of grains, was synthesized using cryogenic mechanical milling. Microstructures of the powder, cryomilled for different times, were investigated using transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results indicated that both the average powder particle size and average grain size approached constant values as cryomilling time increased to 8 hours. The TEM observations indicated that grains in the cryomilled powder were deformed into elongated grains with a high density of deformation faults, and then fracturedviacyclic impact loading in random directions. The fractured fragments from the elongated coarse grains formed nanoscale grains. The occurrence of the elongated grains, from development to disappearance during intermediate stages of milling, suggested that repeated strain fatigue and fracture caused by the cyclic impact loading in random directions, and cold welding were responsible for the formation of a nanocrystalline structure.

authors

• Lavernia Borrego, Enrique

published proceedings

• MRS Advances

author list (cited authors)

• He, J., & Lavernia, E. J.

complete list of authors

• He, Jianhong||Lavernia, Enrique J

publication date

• 2000

publisher

• Springer Nature  Publisher

published in

• MRS Advances  Journal

keywords

• 40 Engineering
• 4016 Materials Engineering

Digital Object Identifier (DOI)

• 10.1557/proc-634-b1.8.1

start page

• b1.8.1

volume

• 634

URL

• http://dx.doi.org/10.1557/proc-634-b1.8.1