omega LATTICE MECHANISM OF {112}< 111 > TWINNING NUCLEATION AND GROWTH AND TERMINATION

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	omega LATTICE MECHANISM OF {112}< 111 > TWINNING NUCLEATION AND GROWTH AND TERMINATION
	Wu Songquan 1,2; Yang Yi 3; Li Geping 1; Ping Dehai 4; Hu Qingmiao 1; Yang Rui 1
刊名	ACTA METALLURGICA SINICA
	2016-02-11
卷号	52 期号:2 页码:249-256
关键词	metal and alloy twin phase transformation omega lattice
ISSN号	0412-1961
通讯作者	Li Geping(gpli@imr.ac.cn)
英文摘要	{112}< 111 >-type twin is a common twinning structure in quenched carbon steel. As carbon content increases, the density of the twin becomes high in the quenched state. Researchers have suggested that understanding such twinning mechanism may help us to understand the martensitic transformation in steel. {112}< 111 > type twin is also commonly observed in other body centered cubic (bcc) metals and alloys, especially deformed under the conditions of low temperatures and/or high strain rates. Yet, due to the intrinsic non-close-packed structure and the rapid speed of twinning process, the mechanisms of twinning nucleation, growth and termination have not been clearly understood although phenomenological mechanisms such as the classical shearing mechanism, dislocation mechanism, or shuffling mechanism, etc., were proposed. Recently, after reviewing numerous investigations on {112}< 111 >-type twinning process both experimentally and theoretically in bcc metals and alloys, it was found that the twinning boundaries are always embedded with omega phase, i.e., the displacement of the first layer of the twin is 1/12 < 111 > for omega instead of 1/6 < 111 > for twin, thus, an omega phase-related {112}< 111 >-type twinning mechanism (so-called omega lattice mechanism) in our previous study is proposed. In order to better understand the co lattice mechanism, in this work, a detailed description of the whole process of nucleation, growth and termination of the {112}< 111 >-type twinning was offered by using the atomic lattice model. The model shows that the twin could nucleate during omega -> bcc transition process, and then grow up by extending or merging of twin embryos, and finally terminate during encountering the different omega variants. Such two-dimensional atomic model can be extended to three-dimensional one, which can finally explain the formation mechanism of an internal twin in one bcc crystal. Moreover, the model suggests that the diffuse omega lattice (omega(diff)) between the ideal omega lattice and bcc lattice (in the twin boundary) plays an important role in promoting the transition of omega <-> bcc during twinning nucleation and growth processes. The results suggest that the {112}< 111 >-type twins are phase transition twin or phase transformation product.
资助项目	National Natural Science Foundation of China[51271200]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000371849600016
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/121786]
专题	金属研究所_中国科学院金属研究所
通讯作者	Li Geping
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Optoelect Mat Chem & Phys, Fuzhou 350002, Peoples R China 3.Baosteel Grp Corp, Res Inst, R&D Ctr, Shanghai 201900, Peoples R China 4.China Univ Petr, Dept Mat Sci & Engn, Beijing 102249, Peoples R China
推荐引用方式 GB/T 7714	Wu Songquan,Yang Yi,Li Geping,et al. omega LATTICE MECHANISM OF {112}< 111 > TWINNING NUCLEATION AND GROWTH AND TERMINATION[J]. ACTA METALLURGICA SINICA,2016,52(2):249-256.
APA	Wu Songquan,Yang Yi,Li Geping,Ping Dehai,Hu Qingmiao,&Yang Rui.(2016).omega LATTICE MECHANISM OF {112}< 111 > TWINNING NUCLEATION AND GROWTH AND TERMINATION.ACTA METALLURGICA SINICA,52(2),249-256.
MLA	Wu Songquan,et al."omega LATTICE MECHANISM OF {112}< 111 > TWINNING NUCLEATION AND GROWTH AND TERMINATION".ACTA METALLURGICA SINICA 52.2(2016):249-256.