Deformation-induced structural transition in body-centred cubic molybdenum

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	Deformation-induced structural transition in body-centred cubic molybdenum
	S. J. Wang; H. Wang; K. Du; W. Zhang; M. L. Sui; S. X. Mao
	2014
发表期刊	Nature Communications
ISSN	2041-1723
卷号	5
摘要	Molybdenum is a refractory metal that is stable in a body-centred cubic structure at all temperatures before melting. Plastic deformation via structural transitions has never been reported for pure molybdenum, while transformation coupled with plasticity is well known for many alloys and ceramics. Here we demonstrate a structural transformation accompanied by shear deformation from an original <001>-oriented body-centred cubic structure to a <110>-oriented face-centred cubic lattice, captured at crack tips during the straining of molybdenum inside a transmission electron microscope at room temperature. The face-centred cubic domains then revert into <111>-oriented body-centred cubic domains, equivalent to a lattice rotation of 54.7 degrees, and similar to 15.4% tensile strain is reached. The face-centred cubic structure appears to be a well-defined metastable state, as evidenced by scanning transmission electron microscopy and nanodiffraction, the Nishiyama-Wassermann and Kurdjumov-Sachs relationships between the face-centred cubic and body-centred cubic structures and molecular dynamics simulations. Our findings reveal a deformation mechanism for elemental metals under high-stress deformation conditions.
部门归属	[wang, s. j. ; du, k. ; zhang, w.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [wang, s. j. ; du, k.] tsinghua univ, beijing natl ctr elect microscopy, beijing 100084, peoples r china. [wang, h.] chinese acad sci, inst met res, div titanium alloys, shenyang 110016, peoples r china. [sui, m. l.] beijing univ technol, inst microstruct & properties adv mat, beijing 100124, peoples r china. [mao, s. x.] univ pittsburgh, dept mech engn & mat sci, pittsburgh, pa 15261 usa. [mao, s. x.] zhejiang univ, dept mat sci & engn, ctr elect microscopy, hangzhou 310027, peoples r china. ; du, k (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; kuidu@imr.ac.cn ; mlsui@bjut.edu.cn
关键词	Molecular-dynamics Simulation Electron-microscopy Phase-transitions Strength Metals Images Compression Diffraction Crystals Nickel
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72919
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. J. Wang,H. Wang,K. Du,et al. Deformation-induced structural transition in body-centred cubic molybdenum[J]. Nature Communications,2014,5.
APA	S. J. Wang,H. Wang,K. Du,W. Zhang,M. L. Sui,&S. X. Mao.(2014).Deformation-induced structural transition in body-centred cubic molybdenum.Nature Communications,5.
MLA	S. J. Wang,et al."Deformation-induced structural transition in body-centred cubic molybdenum".Nature Communications 5(2014).