title: Revealing ultralarge and localized elastic lattice strains in Nb nanowires embedded in NiTi matrix.
abstract: Freestanding nanowires have been found to exhibit ultra-large elastic strains (4 to 7%) and ultra-high strengths, but exploiting their intrinsic superior mechanical properties in bulk forms has proven to be difficult. A recent study has demonstrated that ultra-large elastic strains of ~6% can be achieved in Nb nanowires embedded in a NiTi matrix, on the principle of lattice strain matching. To verify this hypothesis, this study investigated the elastic deformation behavior of a Nb nanowire embedded in NiTi matrix by means of in situ transmission electron microscopic measurement during tensile deformation. The experimental work revealed that ultra-large local elastic lattice strains of up to 8% are induced in the Nb nanowire in regions adjacent to stress-induced martensite domains in the NiTi matrix, whilst other parts of the nanowires exhibit much reduced lattice strains when adjacent to the untransformed austenite in the NiTi matrix. These observations provide a direct evidence of the proposed mechanism of lattice strain matching, thus a novel approach to designing nanocomposites of superior mechanical properties.
authors.affiliation: Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.
authors.forename: Ketao
authors.initials: K
authors.lastname: Zang
authors.affiliation: Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.
authors.forename: Shengcheng
authors.initials: S
authors.lastname: Mao
authors.affiliation: Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.
authors.forename: Jixiang
authors.initials: J
authors.lastname: Cai
authors.affiliation: School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, WA 6009, Australia.
authors.forename: Yinong
authors.initials: Y
authors.lastname: Liu
authors.affiliation: GRIKIN Advanced Materials Co. Ltd., Beijing, 102200, China.
authors.forename: Haixin
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of Materials Science and Engineering, China University of Petroleum-Beijing, Beijing, 102249, China.
authors.forename: Shijie
authors.initials: S
authors.lastname: Hao
authors.affiliation: School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, WA 6009, Australia.|Department of Materials Science and Engineering, China University of Petroleum-Beijing, Beijing, 102249, China.
authors.forename: Daqiang
authors.initials: D
authors.lastname: Jiang
authors.affiliation: Department of Materials Science and Engineering, China University of Petroleum-Beijing, Beijing, 102249, China.
authors.forename: Lishan
authors.initials: L
authors.lastname: Cui