Annealing‐Induced Hardening in Ultrafine‐Grained Ni–Mo Alloys. Issue 9 (18th May 2018)

• Record Type: Journal Article
• Authors: Gubicza, Jenő; Pereira, Pedro Henrique R.; Kapoor, Garima; Huang, Yi; Vadlamani, Subramanya Sarma; Langdon, Terence G.
• Is Part Of: Advanced engineering materials. Volume 20:Issue 9(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-05-18
• Subjects: Annealing -- Dislocations -- Hardening -- Ni–Mo alloys -- Ultrafine‐grained microstructure; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201800184
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : The influence of Mo alloying on annealing‐induced hardening in ultrafine‐grained (UFG) Ni is studied. The hardening observed after low temperature annealing is explained by the annihilation of mobile dislocations and a concomitant clustering of the remaining dislocations into low energy configurations. This study reveals that, with increasing Mo concentration, the hardening effect decreases as the Mo solute atoms hinder the annihilation and rearrangement of dislocations. This trend is the opposite to that observed in electrodeposited Ni–Mo alloys where the larger alloying element concentration yields a higher annealing‐induced strengthening effect. The difference is attributed to the different deformation mechanisms in UFG and nanocrystalline Ni–Mo alloys. Abstract : An annealing‐induced hardening is observed in severely deformed ultrafine‐grained Ni–Mo alloys. This effect is explained by the annihilation of mobile dislocations and a concomitant clustering of the remaining dislocations into low energy configurations. With increasing Mo concentration in ultrafine‐grained Ni alloys, this hardening effect decreases as Mo solute atoms hinder the annihilation and rearrangement of dislocations.