|Effect of Stress-Induced Grain Growth During Room Temperature Tensile Deformation on Ductility in Nanocrystalline Metals|
|Xu WC; Dai PQ; Wu XL(武晓雷); Dai, PQ (reprint author), Fuzhou Univ, Coll Mat Sci & Engn, Fuzhou 350108, Peoples R China.
|Source Publication||BULLETIN OF MATERIALS SCIENCE
|Abstract||In the present study defect-free nanocrystalline (nc) Ni-Co alloys with the Co content ranging from 2.4-59.3% (wt.%) were prepared by pulse electrodeposition. X-ray diffraction analysis shows that only a single face-centred cubic solid solution is formed for each alloy and that the grain size reduces monotonically with increasing Co content, which is consistent with transmission electron microscopy (TEM) observations. In the nc Ni-Co alloys, both the ultimate tensile strength and the elongation to failure increase as the Co content increases. The TEM observations reveal that stress-induced grain growth during tensile deformation is significantly suppressed for the nc Ni-Co alloys rich in Co in sharp contrast to those poor in Co. We believe that sufficient solutes could effectively pin grain boundaries making grain boundary motions (e.g. grain boundary migration and/or grain rotation) during deformation more difficult. Thus, stress-induced grain growth is greatly suppressed. At the same time, shear banding plasticity instability is correspondingly delayed leading to the enhanced ductility.|
|WOS Keyword||CENTERED-CUBIC METALS
; STACKING-FAULT ENERGY
|WOS Research Area||Materials Science
|WOS Subject||Materials Science, Multidisciplinary
|Funding Organization||Natural Science Foundation of Fujian Province [E0810006]
; National 863 projects of China [2007AA03Z325]
|Corresponding Author||Dai, PQ (reprint author), Fuzhou Univ, Coll Mat Sci & Engn, Fuzhou 350108, Peoples R China.|
Xu WC,Dai PQ,Wu XL,et al. Effect of Stress-Induced Grain Growth During Room Temperature Tensile Deformation on Ductility in Nanocrystalline Metals[J]. BULLETIN OF MATERIALS SCIENCE,2010,33(5):561-568.
Xu WC,Dai PQ,武晓雷,&Dai, PQ .(2010).Effect of Stress-Induced Grain Growth During Room Temperature Tensile Deformation on Ductility in Nanocrystalline Metals.BULLETIN OF MATERIALS SCIENCE,33(5),561-568.
Xu WC,et al."Effect of Stress-Induced Grain Growth During Room Temperature Tensile Deformation on Ductility in Nanocrystalline Metals".BULLETIN OF MATERIALS SCIENCE 33.5(2010):561-568.