Grain Orientation Induced Softening in Electrodeposited Gradient Nanostructured Nickel during Cold Rolling Deformation

Reviews on Advanced Materials Science

Zhu Jiang¹  Wang Zhaodong²  Ni Haitao²  Wang Lixia³ 

[1] Chongqing Key Laboratory of Environmental Materials & Remediation Technologies, Chongqing University of Arts and Sciences, Chongqing, 402160, China;College of Chemistry and Environmental Engineering, Chongqing University of Arts and Sciences, Chongqing, 402160, China;College of Intelligent Manufacturing Engineering, Chongqing University of Arts and Sciences, Chongqing, 402160, China;

关键词: gradient structured metal;    nickel;    cold rolling;    microstructure;    microhardness;   

DOI  :  10.1515/rams-2020-0105

来源: DOAJ

【 摘 要 】

Quantitative microstructural evolution and the corresponding microhardness of electrodeposited nanostructured nickel sheet during cold rolling deformation are investigated by x-ray diffraction, transmission electron microscopy and Vicker’s microhardness testing. Particularly, to investigate the effect of stress states on deformation behavior, two series of gradient nanostructured nickel with symmetric structures and the homogeneous counterparts with three levels of grain size are compared based on macro-statistical data. In such hierarchical sandwich-like gradient samples, the layers with larger grain size, as the soft phase, indeed sustain more deformation. Deformation-induced grain rotation changes are observed in the center layers with a relatively larger grain size, accompanied by an obvious decrease in microhardness. According to the quantitative microstructural parameters including the grain size, dislocation density and stacking fault probability before and after deformation, evaluation based on Hall-Petch and Bailey-Hirsch relationships indicates the transition from strain hardening to softening can be attributed to grain orientation change.

【 授权许可】

Unknown