METALLURGY Grain boundary stability governs hardening and softening in extremely fine nanograined metals

IMR OpenIR

	METALLURGY Grain boundary stability governs hardening and softening in extremely fine nanograined metals
	Hu, J.; Shi, Y. N.; Sauvage, X.; Sha, G.; Lu, K.; Lu, K (reprint author), Shenyang Natl Lab Mat Sci, Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.; Lu, K (reprint author), Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, Nanjing 210094, Peoples R China.
	2017-03-24
发表期刊	SCIENCE
ISSN	0036-8075
卷号	355 期号:6331 页码:1292-+
摘要	Conventional metals become harder with decreasing grain sizes, following the classical Hall-Petch relationship. However, this relationship fails and softening occurs at some grain sizes in the nanometer regime for some alloys. In this study, we discovered that plastic deformation mechanism of extremely fine nanograined metals and their hardness are adjustable through tailoring grain boundary (GB) stability. The electrodeposited nanograined nickel-molybdenum (Ni-Mo) samples become softened for grain sizes below 10 nanometers because of GB-mediated processes. With GB stabilization through relaxation and Mo segregation, ultrahigh hardness is achieved in the nanograined samples with a plastic deformation mechanism dominated by generation of extended partial dislocations. Grain boundary stability provides an alternative dimension, in addition to grain size, for producing novel nanograined metals with extraordinary properties.; Conventional metals become harder with decreasing grain sizes, following the classical Hall-Petch relationship. However, this relationship fails and softening occurs at some grain sizes in the nanometer regime for some alloys. In this study, we discovered that plastic deformation mechanism of extremely fine nanograined metals and their hardness are adjustable through tailoring grain boundary (GB) stability. The electrodeposited nanograined nickel-molybdenum (Ni-Mo) samples become softened for grain sizes below 10 nanometers because of GB-mediated processes. With GB stabilization through relaxation and Mo segregation, ultrahigh hardness is achieved in the nanograined samples with a plastic deformation mechanism dominated by generation of extended partial dislocations. Grain boundary stability provides an alternative dimension, in addition to grain size, for producing novel nanograined metals with extraordinary properties.
部门归属	[hu, j. ; shi, y. n. ; lu, k.] shenyang natl lab mat sci, chinese acad sci, inst met res, shenyang 110016, peoples r china ; [sauvage, x.] normandie univ, cnrs, inst natl sci appl rouen, unirouen, f-76000 rouen, france ; [lu, k.] nanjing univ sci & technol, herbert gleiter inst nanosci, nanjing 210094, peoples r china
学科领域	Multidisciplinary Sciences
收录类别	SCI
语种	英语
WOS记录号	WOS:000397082900034
引用统计	被引频次：704[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/78224
专题	中国科学院金属研究所
通讯作者	Lu, K (reprint author), Shenyang Natl Lab Mat Sci, Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.; Lu, K (reprint author), Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, Nanjing 210094, Peoples R China.
推荐引用方式 GB/T 7714	Hu, J.,Shi, Y. N.,Sauvage, X.,et al. METALLURGY Grain boundary stability governs hardening and softening in extremely fine nanograined metals[J]. SCIENCE,2017,355(6331):1292-+.
APA	Hu, J..,Shi, Y. N..,Sauvage, X..,Sha, G..,Lu, K..,...&Lu, K .(2017).METALLURGY Grain boundary stability governs hardening and softening in extremely fine nanograined metals.SCIENCE,355(6331),1292-+.
MLA	Hu, J.,et al."METALLURGY Grain boundary stability governs hardening and softening in extremely fine nanograined metals".SCIENCE 355.6331(2017):1292-+.