Plastic yielding and tensile strength of near-micrometer grain size pure iron

doi:10.1016/j.msea.2018.12.056

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Plastic yielding and tensile strength of near-micrometer grain size pure iron
	Ruan Q ; Yang MX(杨沐鑫); Liu W ; Godfrey A
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2019-01-28
卷号	744 页码:764-772
关键词	Electron microscopy Stress/strain measurements EBSD Iron alloys Spark plasma sintering
ISSN号	0921-5093
DOI	10.1016/j.msea.2018.12.056
英文摘要	In order to investigate the influence on mechanical properties of grain size in the near-micrometer regime, samples of Fe with nearly full density were prepared using the spark plasma sintering (SPS) technique with average grain sizes of 1.0 mu m, 2.6 mu m and 4.0 mu m. In each of these samples the resulting sintered material was in a nearly fully-recrystallized condition with a random texture. The mechanical properties of the samples were examined via tensile testing. A strong dependence of the tensile flow characteristics on the average grain size was observed in this size regime, with the 1.0 mu m grain-size sample showing a very high strength, but no uniform elongation and a large yield drop developed in the 2.6 mu m grain-size sample. Analysis of the grain size dependence of yield strength suggests a positive Hall-Petch deviation from the expected grain boundary strengthening in the SPS Fe samples, assuming a typical range of values for the grain boundary strength (Hall-Petch coefficient). Pre-compression of the 2.6 mu m grain-size prior to tensile testing sample results in a removal of the yield drop and a corresponding large decrease in the yield stress by as much as 145 MPa. The observations suggest that the positive Hall-Petch deviation seen previously in the near-micrometer regime for fully recrystallized Al and Cu may also be present in Fe, and highlight the likely importance of dislocation source hardening in this grain size regime.
分类号	一类
WOS关键词	HALL-PETCH SLOPE ; MECHANICAL-PROPERTIES ; FLOW-STRESS ; DEFORMATION ; TEMPERATURE ; ALUMINUM ; ALLOY ; STEEL ; AL ; SUBDIVISION
WOS研究方向	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000457510300079
资助机构	National Natural Science Foundation of China [51671113, 51601204]
其他责任者	Godfrey, A
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/78441]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.{Ruan, Qing、Liu, Wei、Godfrey, Andy} Tsinghua Univ, Sch Mat Sci & Engn, Lab Adv Mat MoE, Beijing 100084, Peoples R China 2.{Yang, Muxin} Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Ruan Q,Yang MX,Liu W,et al. Plastic yielding and tensile strength of near-micrometer grain size pure iron[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2019,744:764-772.
APA	Ruan Q,杨沐鑫,Liu W,&Godfrey A.(2019).Plastic yielding and tensile strength of near-micrometer grain size pure iron.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,744,764-772.
MLA	Ruan Q,et al."Plastic yielding and tensile strength of near-micrometer grain size pure iron".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 744(2019):764-772.