The growth of Ni5Al3 in L10 martensite studied by in situ transmission electron microscopy and high resolution electron microscopy

Schryvers, D.; Ma, Ying

doi:10.1016/0925-8388(94)01467-1

Cited by 23 publications

(7 citation statements)

References 18 publications

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“…[11,12] However, the stability of the martensitic transformation, and hence the shape memory effect, has been shown to be dependent on the presence of the Ni 5 Al 3 and Ni 2 Al phases. [21,22,23] In the latter case, fine highly symmetric 5:3 precipitates appear in the B2 matrix and grow into large plates, also resembling the L1o martensite plates in morphology. [16] They suggested an ordered orthorhombic unit cell of the Pt 5 Ga 3 type, schematically presented in Figure 2(c).…”

Section: Introductionmentioning

confidence: 98%

X-ray study of phase transformations in martensitic Ni-Al alloys

Potapov

Udovenko

Song

et al. 1997

Metall Mater Trans A

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phases in Ni-Al alloys with L1o ↔ B2 thermoelastic martensitic transformation has been studied by X-ray analysis. Ni 5 Al 3 can form from both the L1o and B2 structures, but the kinetics of L1o → Ni 5 Al 3 and B2 → Ni 5 Al 3 reactions are significantly different. A homogeneous mechanism for the former reaction and a mechanism of precipitation and growth for the latter are proposed. Ni 2 Al forms from the B2 structure by the complex rearrangement of atoms. The initial stage of this reaction proceeds very rapidly and involves segregation of Ni atoms into Ni-rich zones leading to a Ni depletion in the surrounding regions. The nucleation of Ni 2 Al retards the Ni 5 Al 3 formation, so preaging in the B2 region affects the kinetics of the L1o → Ni 5 Al 3 reaction on further aging in the L1o region. The microstructural mechanism for this effect is suggested.

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Section: Introductionmentioning

confidence: 98%

X-ray study of phase transformations in martensitic Ni-Al alloys

Potapov

Udovenko

Song

et al. 1997

Metall Mater Trans A

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“…The stability of the resultant BCT phase was investigated by unloading the nanowires after complete transformation to the BCT phase had occurred. Ab initio calculations of the deformation of an initially B2 NiAl lattice along the volume-preserving Bain path indicate that the BCT phase is unstable for NiAl. , However, a metastable BCT phase has been experimentally reported for NiAl by Schryvers and Ma. The energetics of the Voter−Chen potential utilized in this work were tested by calculating the potential energy of a bulk NiAl system by varying the tetragonal ratio c / a along the volume-conserving Bain deformation path.…”

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confidence: 99%

Stress-Induced Martensitic Phase Transformation in Intermetallic Nickel Aluminum Nanowires

Park

2006

Nano Lett.

101

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Atomistic simulations are utilized to demonstrate a stress-induced martensitic phase transformation in intermetallic nickel aluminum (NiAl) nanowires. The martensitic phase transformation occurs by the propagation and annihilation of {101} twinning planes and transforms the initially B2 NiAl nanowires to a body-centered tetragonal (BCT) phase. The instability of the resulting BCT phase allows pseudoelastic recovery of inelastic strains on the order of 40% at all deformation temperatures.

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“…Chen and Han agreed almost fully with this relationship, saying that the twin system lies on (1 1 1)/ < 1 1 2 > [13]. Litvinov stated that ␤ needles are in twin orientation with twinning planes of the (1 0 0) family [14] and ordering was noted as continuous over the ␤ interfaces [15].…”

Section: Martensite Twinningmentioning

confidence: 83%

“…The micro-twin planes of the ␤ structure accommodate the constant shear of the transformation, i.e. the habit plane stress, which exists because the parent material, NiAl, has a small twin surface energy [15]. The plate widths of the martensite needles were found to be as thin as 6.6 nm [11] and the stacking sequence of ␤ in ␤ was found to vary quite considerably, with wide twins of up to several hundred nanometers often observed.…”

Section: Martensite Twinningmentioning

confidence: 97%