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{112}<111>孪生的形核和长大及终止的w点阵机制
w LATTICE MECHANISM OF {112}<111> TWINNING NUCLEATION AND GROWTHAND TERMINATION

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吴松全 ¹ 杨义 ² 李阁平 ³ ^* 平德海 ⁴ 胡青苗 ³ 杨锐 ³

文摘	针对体心立方(bcc)结构金属及合金{112}<111>孪生的w点阵机制, 利用点阵模型详解了bcc结构金属及合金 {112}<111>孪晶形核、长大和终止全过程. 模型揭示了孪晶可以通过w→bcc转变过程形成孪晶核胚, 再通过孪晶核胚生长或合并的方式长大, 最终与特殊位向w相作用受阻而停止. 该机制说明了{112}<111>类型孪晶是一种相变孪晶.
其他语种文摘	{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 w phase, i.e., the displacement of the first layer of the twin is 1/12 <111> for w instead of 1/6 <111> for twin, thus, an w phase-related {112}<111>-type twinning mechanism (so-called w lattice mechanism) in our previous study is proposed. In order to better understand the w 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 w→bcc transition process, and then grow up by extending or merging of twin embryos, and finally terminate during encountering the different w 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 w lattice (w_(diff)) between the ideal w lattice and bcc lattice (in the twin boundary) plays an important role in promoting the transition of w?bcc during twinning nucleation and growth processes. The results suggest that the {112}<111>-type twins are phase transition twin or phase transformation product.
来源	金属学报 ,2016,52(2):249-256 【核心库】
DOI	10.11900/0412.1961.2015.00309
关键词	金属和合金 ; 孪晶 ; 相变 ; w点阵
地址	1. 中国科学院金属研究所, 中国科学院光电材料化学与物理重点实验室, 沈阳, 110016 2. 宝钢集团有限公司中央研究院(技术中心), 上海, 201900 3. 中国科学院金属研究所, 沈阳, 110016 4. 中国石油大学(北京)材料科学与工程系, 北京, 102249
语种	中文
文献类型	研究性论文
ISSN	0412-1961
学科	金属学与金属工艺
基金	国家自然科学基金资助项目
文献收藏号	CSCD:5644657

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