Structural phase transformation and shape memory effect in ZrRh and ZrIr

Semenova, E. L.; Kudryavtsev, Y. V.

doi:10.1016/0925-8388(94)90729-3

Cited by 44 publications

(41 citation statements)

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“…As for the case of ZrRh alloy having complete SME and wide hysteresis [13] when the presence of only one martensite was reported it should be mentioned that we can find the similar situation in [10]. The authors of this paper also reported about the one martensite with the results of dilatometric measurements with two stages of reverse MT.…”

Section: Thermodynamic and Sme Behavioursupporting

confidence: 59%

“…Later, Semenova and Kudryavtsev [13] detected the complete SME for ZrRh alloy. The structure of martensites of ZrRh and ZrIr alloys was redefined as B19-type (Table 5) [3,13]. Koval, Firstov and Kotko have found the nearly complete SME for ZrCu [2].…”

Section: Introductionmentioning

confidence: 99%

“…Then, the crystal structure for ZrRh martensite was defined as FeB-type [12]. Later, Semenova and Kudryavtsev [13] detected the complete SME for ZrRh alloy. The structure of martensites of ZrRh and ZrIr alloys was redefined as B19-type (Table 5) [3,13].…”

Section: Introductionmentioning

confidence: 99%

“…Alloying and thermal cycling result in the changes of thermal and hysteretic properties and in the increase of shape recovery ratio up to 100% for ZrCu-based alloys [2,14,15]. Crystal structure of ZrCu martensites was determined as B19-type [16,17] similar to TiNi [18,19] and ZrRh, ZrIr [13] ( Table 1). For ZrRu (1x) Pd x martensites, the authors of [20] claimed that its crystal structure belongs to the CrB-type (Table 5).…”

Section: Introductionmentioning

confidence: 99%

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Shape Memory Effect Driven by Diffusionless and Diffusional Transformations at Elevated Temperatures

2002

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Several alloy systems can be selected for high-temperature shape-memory alloys, defined as alloys with stable reverse martensitic-transformation temperatures above 100C. However, due to the lack of minimum quality standards for stability, ductility, functional behaviour, and reliability, no successful applications have been realised so far. Nevertheless, research on high-temperature shapememory alloys (HTSMA) is an important topic not only for scientific reasons but also due to the market pull. This paper reviews some novel HTSMA systems showing shape-memory effect at elevated temperatures driven by martensitic (diffusionless) and diffusional transformations.Можна навести певну кількість систем сплавів, що можуть бути визначені, як високотемпературні сплави з ефектом пам'яті форми, що в свою чергу ви-значаються як сплави зі стабільними температурами зворотного мартенсит-ного перетворення, вищими за 100С. На жаль, невідомо жодного випадку успішного застосування високотемпературних сплавів з ефектом пам'яті форми, завдяки відсутності вимог щодо їх стабільності, пластичності, функ-ціональної поведінки та надійності. Не зважаючи на це, дослідження високо-температурних сплавів з ефектом пам'яті форми є важливим не тільки з точ-ки зору фундаментальної науки, але й завдяки вимогам ринку. Дана робота присвячена розглядові деяких новітніх систем високотемпературних сплавів з ефектом пам'яті форми, що зумовлений мартенситним (бездифузійним) та дифузійним перетвореннями.Можно привести достаточное количество систем сплавов, которые подпа-дают под определение высокотемпературных сплавов с эффектом памяти формы -сплавов, в которых стабильное обратное мартенситное превра-щение протекает при температурах выше 100С. К сожалению, до сих пор Успехи физ. мет. / Usp. Fiz. Met. 2002, т. 3, сс. 305-355 Îòòèñêè äîñòóïíû íåïîñðåäñòâåííî îò èçäàòåëÿ Ôîòîêîïèðîâàíèå ðàçðåøåíî òîëüêî â ñîîòâåòñòâèè ñ ëèöåíçèåé 2002 ÈÌÔ (Èíñòèòóò ìåòàëëîôèçèêè èì. Ã. Â. Êóðäþìîâà ÍÀÍ Óêðàèíû) Íàïå÷àòàíî â Óêðàèíå.

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Section: Thermodynamic and Sme Behavioursupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shape Memory Effect Driven by Diffusionless and Diffusional Transformations at Elevated Temperatures

2002

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“…The high-temperature TiNi modification with a CsCl-type cubic structure undergoes martensitic transformation at a temperature that is very sensitive to alloy composition (it abruptly changes if stoichiometry deviates from 1 : 1), thermal treatment, and admixtures of other elements [20,22]. The martensitic phase, which has a rhombic structure with AuCd-type monoclinic distortion (Table 1), is unstable and dependent on the same factors as the transformation temperature.…”

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confidence: 97%

TiNi-YNi alloys. Interaction with hydrogen

Semenova

Khomko

Petyukh

2007

Powder Metall Met Ceram

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Phase equilibria in the Ti-Ni-Y system at the TiNi-YNi section are studied using physical and chemical methods (metallography, radiography, differential thermal and electron microprobe analyses). Data on hydrogen sorption and desorption by ternary system Y-Ni alloys are obtained. It is shown that the TiNiYNi section is quasibinary eutectic with the coordinates 990°C and ∼40 at.% Y. The solubility of Y and Ti in TiNi and YNi mononickelides is approximately <0.3 and 1 at.%. Equiatomic ternary (TiNiY) phase in the Ti-Ni-Y is not found. The alloy of equiatomic composition turns out to be ternary: + + . Based on sorption data, two hydrides may exist in the alloys with 30 to 40 at.% Y, which are thermally stable at 800°C and over a range of 300 to 600°C. It is revealed that the maximum amount of hydrogen at 0.1 MPa is absorbed by binary the YNi, YNi 2 , and YNi 5 phases at room temperature.We have previously studied the phase equilibria in ternary systems of TiNi with Sc, Zr, Hf, Rh, Ru, and Ir. The sections between TiNi equiatomic phases formed by Ti or Ni with the above metals are shown to be quasibinary [1][2][3][4]. The mononickelides of transient metals, which may form a quasibinary section by interacting with TiNi, include YNi in view of its thermodynamic properties. The Ni-Ti-Y system is of interest in that it has a component that, based on its position in the periodic table, should be similar to scandium (in the group) and zirconium (in the period) and whose alloys may show chemical and thermomechanical properties peculiar to Ni-Sc-Ti (Zr, Hf) systems.Published data on the interaction of components in the Ni-Ti-Y system are limited to the patented ternary alloy Ti-(50-60) at.% Ni-(0.001-0.05) at.% Y [5]. Yttrium admixtures promote the deoxidation of TiNi and improve its deformability, increase the martensitic transformation temperature, and constrict the temperature hysteresis.There are no published data on phase equilibria in the ternary system. Bounding binary systems were studied repeatedly, their phase diagrams have been plotted [6][7][8][9][10][11][12][13]. According to the experimental data obtained in [6] for distilled yttrium and iodide titanium as starting materials, the Ti-Y is a eutectic system with eutectic coordinates: L ↔ βTi (0.2 at.% Y) + αY, 18.7 at.% Ti, and 1355 ± 10°C. The metatectic reaction βY → αY + L occurs in yttrium-based alloys at 1440 ± 5°C.The Ti-Y phase diagram [6] differs from those in [7,8] that are based on less pure components only in transformation temperatures and composition of invariant points. Thermodynamic calculations of phase equilibria in the Ti-Y system based on the experimental data [6-8] and taking account of experimental uncertainties admit that the phase diagram may be plotted using the reaction temperatures from [6] but assume that immiscibility is possible in liquid state at ~19 to 70 at.% Ti [9].The Ni-Y system is rich in intermediate phases: there are nine of them and they have very limited homogeneity regions. Only two of them ⎯ Y...

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The structural, mechanical, and thermodynamic properties of B2‐type TMZr (TM = Ru, Mo, Rh, Os, and Re) compounds from first‐principles calculations

Pan

2019

Int J of Quantum Chemistry

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The B2‐type cubic Zr‐based compounds are attractive advanced high‐temperature materials because of the strong and symmetrical bonds. However, the mechanical and thermodynamic properties of the B2‐type cubic Zr‐based compounds are not well understood. Here, we use the first‐principles calculations to investigate the structural, elastic modulus, ductility, and thermodynamic properties of TMZr (TM = Ru, Mo, Rh, Os, and Re) compounds. Two novel TMZr compounds, MoZr and ReZr, are first predicted by using the phonon dispersion and formation enthalpy, respectively. The results show that the B2‐type TMZr compounds not only exhibit high elastic modulus but also show better ductility due to the symmetrical TM‐Zr metallic bonds. In particular, the calculated elastic modulus of OsZr is larger than that of the other four TMZr compounds, indicating that the OsZr shows the strongest deformation resistance in five TMZr compounds. The calculated Θ D of RuZr is 328 K, which is larger than that of the other four TMZr compounds. The calculated phonon density of state shows that the high‐temperature thermodynamic properties of TMZr derive from the vibration of Zr atom. Therefore, our work predicts that the B2‐type OsZr is an attractive high‐temperature structural material.

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Structural phase transformation and shape memory effect in ZrRh and ZrIr

Cited by 44 publications

References 2 publications

Shape Memory Effect Driven by Diffusionless and Diffusional Transformations at Elevated Temperatures

Shape Memory Effect Driven by Diffusionless and Diffusional Transformations at Elevated Temperatures

TiNi-YNi alloys. Interaction with hydrogen

The structural, mechanical, and thermodynamic properties of B2‐type TMZr (TM = Ru, Mo, Rh, Os, and Re) compounds from first‐principles calculations

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