Strain-induced dimensionality crossover and associated pseudoelasticity in the premartensitic phase of Ni2MnGa

Strain-induced dimensionality crossover and associated pseudoelasticity in the premartensitic phase of Ni2MnGa
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Ni2MnGa 预马氏体相中应变引起的维数交叉和相关伪弹性

DOI:
10.1063/1.3506508
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发表时间:
2010-10
影响因子:
4
通讯作者:
Zuo, L.
Zuo, L.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Nie, Z. H.;Ren, Y.;Wang, Y. D.;Liu, D. M.;Brown, D. E.;Wang, G.;Zuo, L.

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利用原位高能x射线衍射揭示了Ni2MnGa磁性形状记忆合金预马氏体相两步伪弹性行为的原子机制。外加应力首先将预马氏体相的三维调制结构抑制为二维调制结构,这伴随着调制波矢量的变化,并可容纳高达1%的大晶格应变。随着应力的进一步增大,二维调制预马氏体转变为五层调制马氏体。原子调制的应力诱导维数交叉的观察不仅对了解先进形状记忆合金的力学性能,而且对了解具有非均相结构的凝聚态物质的物理性能具有广泛的影响。
The in situ high-energy x-ray diffraction was used for revealing an atomic mechanism on the two-step pseudoelastic behavior found in the premartensitic phase of Ni2MnGa magnetic shape memory alloy. The applied stress first suppresses the three-dimensional modulated structure of the premartensitic phase to a two-dimensional modulated one, which is accompanied by a change in the modulation wave vector and accommodates a large lattice strain reaching ∼1%. With further increasing stress, the two-dimensional modulated premartensite transforms to the five-layered modulated martensite. The observation of the stress-induced dimensionality crossover of atomic modulation has broad impacts in understanding not only the mechanical properties of advanced shape memory alloys but also the physical properties of condensed matter with heterogeneous structures.
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