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

doi:10.1016/j.msea.2018.12.056

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	Plastic yielding and tensile strength of near-micrometer grain size pure iron
	Ruan Q ; Yang MX(杨沐鑫); Liu W ; Godfrey A
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2019-01-28
卷号	744 页码:764-772
ISSN	0921-5093
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.
关键词	Electron microscopy Stress/strain measurements EBSD Iron alloys Spark plasma sintering
DOI	10.1016/j.msea.2018.12.056
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000457510300079
关键词[WOS]	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
WOS类目	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
项目资助者	National Natural Science Foundation of China [51671113, 51601204]
论文分区	一类
力学所作者排名	2
RpAuthor	Godfrey, A
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/78441
专题	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.

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