<i>In situ</i> synchrotron X-ray diffraction study of deformation behavior and load transfer in a Ti2Ni-NiTi composite

Zhang, Junsong; Liu, Yinong; Ren, Yang; Huan, Yong; Hao, Shijie; Yu, Cun; Shao, Yang; Ru, Yadong; Jiang, Daqiang; Cui, Lishan

doi:10.1063/1.4892352

Cited by 17 publications

(9 citation statements)

References 21 publications

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“…The deformation stages of second-phase reinforced SMA nanocomposite are distinguished by stress-strain curves as well as the lattice strain obtained from high energy x-ray diffraction results 21 23 25 37 38 . Here, we show that the deformation stages of the nanocomposite are clearly reflected in the curve, where different stages are well separated by its peaks ( Fig.…”

Section: Discussionmentioning

confidence: 99%

Origin of high strength, low modulus superelasticity in nanowire-shape memory alloy composites

Zhang

Zong

Cui

et al. 2017

Sci Rep

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An open question is the underlying mechanisms for a recent discovered nanocomposite, which composed of shape memory alloy (SMA) matrix with embedded metallic nanowires (NWs), demonstrating novel mechanical properties, such as large quasi-linear elastic strain, low Young’s modulus and high yield strength. We use finite element simulations to investigate the interplay between the superelasticity of SMA matrix and the elastic-plastic deformation of embedded NWs. Our results show that stress transfer plays a dominated role in determining the quasi-linear behavior of the nanocomposite. The corresponding microstructure evolution indicate that the transfer is due to the coupling between plastic deformation within the NWs and martensitic transformation in the matrix, i.e., the martensitic transformation of the SMA matrix promotes local plastic deformation nearby, and the high plastic strain region of NWs retains considerable martensite in the surrounding SMA matrix, thus facilitating continues martensitic transformation in subsequent loading. Based on these findings, we propose a general criterion for achieving quasi-linear elasticity.

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Section: Discussionmentioning

confidence: 99%

Origin of high strength, low modulus superelasticity in nanowire-shape memory alloy composites

Zhang

Zong

Cui

et al. 2017

Sci Rep

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“…The further moderate increase in the true stress on the composite Fig. 7(b) is clearly caused by the strain hardening of the B19' martensite and the plastic deformation of tungsten particles, just like that of the in-situ NiTi/Ti 5 Si 3 , NiTi/Ti 3 Sn and NiTi/ Ti 2 Ni composites [16,18,19]. The maximum lattice strain reached in the W (110) of the composite was 0.38% before the fracture of the WeNi 42 Ti 53 Nb 5 composite.…”

Section: Resultsmentioning

confidence: 99%

“…The lattice strain curves of B19'eNiTi (111) and B19'eNiTi (220) displayed a plateau region at the stress of 230 MPa, while the lattice strain of W still increased linearly. According to the previous studies [19], the non-linear nature of the lattice strain curve may be attributed to the occurrence of the martensite reorientation. The stress on the B19' martensite during this stage of deformation was very low, and the increasing external load was mainly borne by the W phase, implying gradual load transfer from NiTi matrix to W particles.…”

Section: Resultsmentioning

confidence: 99%

Fabrication, microstructure and mechanical properties of W NiTi composites

Shao

Guo

Huan

et al. 2017

Journal of Alloys and Compounds

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a b s t r a c tNew two-phase tungsten-based composites containing 88 wt% tungsten powders and 12 wt% nearly equiatomic NiTi alloy deforming by martensite variant detwinning were fabricated by infiltration and hot pressing in this study. 53 Nb 5 composite exhibited a double-yielding phenomenon under compression with an ultimate compressive strength of 3820 MPa and a deformation of 50.4%. In-situ synchrotron high-energy Xray diffraction measurements revealed the first yielding was caused by the martensite reorientation of the NiTi matrix and the second was due to the commencement of massive plastic deformation of the reoriented martensite and is also attributed to the microscopic internal fracturing of the W particles.

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“…Then exceptional mechanical performances of the composite, such as high strength and large elastic strain were achieved [1]. As a result, tailoring and obtaining superior structural-functional properties by combining SMA with other reinforced phase in micro/nano scale, has become a new focus in materials science and design researches [1,[12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

A nano lamella NbTi–NiTi composite with high strength

Jiang

Hao

et al. 2015

Materials Science and Engineering: A

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A hypereutectic Nb 60 Ti 24 Ni 16 (at.%) alloy was prepared by vacuum induction melting, and a nano lamellae NbTi-NiTi composite was obtained by hot-forging and wire-drawing of the ingot. Microscopic analysis showed that NbTi and NiTi nano lamellae distributed alternatively in the composite, and aligned along the wire axial direction, with a high volume fraction (~70%) of NbTi nano lamellae. In situ synchrotron X-ray diffraction analysis revealed that stress induced martensitic transformation occurred upon loading, which would effectively weaken the stress concentration at the interface and avoid the introduction of defects into the nano reinforced phase. Then the embedded NbTi nano lamellae exhibited a high elastic strain up to 2.72%, 1.5 times as high as that of the Nb nanowires embedded in a conventional plastic matrix, and the corresponding stress carried by NbTi was evaluated as 2.53 GPa. The high volume fraction of NbTi nano lamellae improved the translation of high strength from the nano reinforced phase into bulk properties of the composite, with a platform stress of ~1.7 GPa and a fracture strength of ~1.9 GPa.

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In situ synchrotron X-ray diffraction study of deformation behavior and load transfer in a Ti2Ni-NiTi composite

Cited by 17 publications

References 21 publications

Origin of high strength, low modulus superelasticity in nanowire-shape memory alloy composites

Origin of high strength, low modulus superelasticity in nanowire-shape memory alloy composites

Fabrication, microstructure and mechanical properties of W NiTi composites

A nano lamella NbTi–NiTi composite with high strength

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