Pt Schwarz crystals stabilized by minimal-surface grain boundaries and twins at the grain size limit

doi:10.1016/j.actamat.2024.120007

IMR OpenIR

	Pt Schwarz crystals stabilized by minimal-surface grain boundaries and twins at the grain size limit
	Fu, H. L.1,2; Zhou, X.1; Gao, Z. P.1,2; Jin, Z. H.1; Li, X. Y.1; Lu, K.1,3
通讯作者	Jin, Z. H.(zhjin@imr.ac.cn) ; Li, X. Y.(xyli@imr.ac.cn)
	2024-09-01
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	276 页码:10
摘要	Schwarz crystals with uniformly distributed twins enclosed by general grain boundaries (GBs) resembling triply minimal-surfaces were observed in high stacking fault energy metal Pt which is believed not readily to twin. By refining the grains of pure Pt from 140 mu m to several nanometers via plastic deformation technique, deformation twins were found to emerge numerously and the structural morphologies of Schwarz crystals can be identified at grain sizes below 4 nm. Both experiments and atomistic simulations suggest that Pt Schwarz crystals are thermally stable at temperatures approaching the thermal equilibrium melting point. The measured room temperature microhardness as a function of grain size, on the other hand, may increase monotonically up to 12.9 GPa, revealing a sustained Hall-Petch relationship. The observed outstanding mechanical stabilities can be attributed to that, regardless of the critical twin size and the stacking fault energy of the material, the plastic deformation at the grain size limit is solely limited by twinning and both the nucleation and bowing-out of twinning partial dislocations from GB sources are notoriously difficult according to simulations and theory.
关键词	Schwarz crystal Platinum Polycrystal Grain boundaries Mechanical twinning Structural stability Hall-petch relationship Molecular dynamics
资助者	National Natural Science Foundation of China ; Chinese Academy of Sciences
DOI	10.1016/j.actamat.2024.120007
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52225102] ; Chinese Academy of Sciences[XDB0510000]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001259103300001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：3[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/321006/187667
专题	中国科学院金属研究所
通讯作者	Jin, Z. H.; Li, X. Y.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Liaoning Acad Mat, 280 Chuangxin Rd, Shenyang 110167, Peoples R China
推荐引用方式 GB/T 7714	Fu, H. L.,Zhou, X.,Gao, Z. P.,et al. Pt Schwarz crystals stabilized by minimal-surface grain boundaries and twins at the grain size limit[J]. ACTA MATERIALIA,2024,276:10.
APA	Fu, H. L.,Zhou, X.,Gao, Z. P.,Jin, Z. H.,Li, X. Y.,&Lu, K..(2024).Pt Schwarz crystals stabilized by minimal-surface grain boundaries and twins at the grain size limit.ACTA MATERIALIA,276,10.
MLA	Fu, H. L.,et al."Pt Schwarz crystals stabilized by minimal-surface grain boundaries and twins at the grain size limit".ACTA MATERIALIA 276(2024):10.