Unit cell determination in CuZr martensite by electron microscopy and X-ray diffraction

Schryvers, D.; Firstov, G.S.; Seo, Jin Won; Humbeeck, Jan Van; Koval, Yu. N.

doi:10.1016/s1359-6462(97)00003-1

Cited by 134 publications

(112 citation statements)

References 9 publications

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“…In [5] the lattice correspondence between B2 and B19' for ZrCu was supposed as (Fig. 5 (a)) shows that their perfect match close to Ms can favor the formation of B19' at first on cooling.…”

Section: Resultsmentioning

confidence: 96%

“…Knowing already a presence of two martensitic phases (Cm and B19") as a result of MT in ZrCu [5] it was obvious to perform in situ high temperature X-ray diffraction measurements in order to bring into correlation structural parameters of all the present phases and there order of appearance with the obtained heats and temperatures of the extracted intrinsic MT steps.…”

Section: Resultsmentioning

confidence: 99%

“…It has been shown that these intermetallics exhibit perfect shape memory effect [1,2,4] during MT with wide temperature hysteresis from high-temperature B2 phase into two monoclinic phases belonging to Cm and P2!/m space groups [5]. The process of the actual formation and disappearance of two martensites and austenite during the complete cycle of the MT in ZrCu intermetallic compound is a subject of the present investigation.…”

Section: Introductionmentioning

confidence: 93%

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Peculiarities of the martensitic transformation in ZrCu intermetallic compound - potential high temperature SMA

2001

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Interaction of two martensitic phases during martensitic transformation (MT) in ZrCu intermetallic compound was studied by means of in situ high-temperature X-ray diffraction studies, internal friction and calorimetric measurements. Some regularities of the mutual formation and disappearance of two martensites on thermal cycling through the temperature interval of the MT were established. The mechanism of the MT in ZrCu intermetallic compounds is discussed.

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“…In [5] the lattice correspondence between B2 and B19' for ZrCu was supposed as (Fig. 5 (a)) shows that their perfect match close to Ms can favor the formation of B19' at first on cooling.…”

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

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Peculiarities of the martensitic transformation in ZrCu intermetallic compound - potential high temperature SMA

2001

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“…Among these the binary Cu-Zr system appears to be a good representative [24]. In practise it turns out that the martensitic transformation is similar to that in Ni-Ti, which is not surprising considering the elements involved [25,26,27]. Macroscopic experiments, however, indicated a rather complex behaviour of the material during the transition before and after cycling or by the addition of ternary elements [28,29].…”

Section: Martensite In Cuzrmentioning

confidence: 99%

“…In order to help to clarify some of the questions in this respect an extensive investigation of the atomic and microstructure of the CuZr martensite was started. In a first step the X-ray data was confronted with lattice parameters and space group symmetry obtained from detailed SAED tilting experiments which lead to the refinement of the atomic positions in the product structures [27]. In most samples two different martensitic structures were found, the smallest one being of the B19'.…”

Section: Martensite In Cuzrmentioning

confidence: 99%

Electron Microscopy Studies of Martensite Microstructures

Schryvers

1997

J. Phys. IV France

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Abstract. An overview will be given of some recent results of microstructural electron microscopy studies on martensitic systems. The precursor structure observed in a ternary Ni-Mn-Ti alloy and its correlation with the ensuing stacking sequence is presented. New types of materials of a well known alloy, in casu splat-cooled and nanoscale thin films of Ni-A1 are investigated revealing particular morphologies of the microtwin stackings in the martensite. The complex microstructure with two martensite structures, multiple macro-and microtwinning and different out-of-phase type defects in CuZr is also discussed.

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Analysis of Melting and Solidification Behaviour of Glass‐forming Alloys by Synchrotron Radiation

Başer¹,

Boström²,

Stoica³

et al. 2007

Adv Eng Mater

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It is known that bulk metallic glasses (BMGs) combine high strength with high corrosion resistance properties, which cannot be obtained from corresponding crystalline alloys. Fe-based metallic glasses have been studied widely during the last decade as an emerging engineering material. [1] It is mentioned that a small addition of large atoms, such as Y to a base alloy, is very helpful in terms of glass formation. [2] Y played the role of oxygen scavenger in Fe-Cr-Mo-C-B alloys, leading to the suppression of heterogeneous nucleation and improving glass formability. [3] Glass formation in Fe-based alloy with Y addition is also favored thermodynamically, resulting in an evident enhancement of glass froming ability (GFA), leading the alloy composition close to eutectic point. [4] Cu-Zr binary alloys form bulk metallic glasses with high strength and good ductility. [5] Amorphous phases have been prepared in a composition range around the equiatomic Cu 50 Zr 50 composition. The occurence of eutectic melting seems to promote glass-formation, even if a competitive growth between a primary dendritic phase and an eutectic microstructure may lead to off-eutectic glass-forming compositions. [6] Glass-formation in metallic systems is obtained if a suitable undercooling of the liquid alloy is obtained during the casting. This process is strongly related to the nucleation frequency of crystalline phases, which defines the phase selection during solidification. So, an in-situ analysis of melting and solidification of glass-forming alloys is desirable for an optimisation of processing parameters. In this paper, we investigated melting and solidification behaviour of Fe 48 Cr 15 -Mo 14 Y 2 C 15 B 6 and Cu 50 Zr 50 alloys by in-situ X-ray diffraction analysis obtained by synchrotron radiation at the European Synchrotron Radiation Facility (ESRF). In order to understand melting and solidification behaviour, the alloys have been analysed by high temperature differential scanning calorimetry (HTDSC). The phase mixtures were identified during melting and solidification in order to obtain information on phase selection during casting. ExperimentalMaster alloys (Fe 48 Cr 15 Mo 14 Y 2 C 15 B 6 and Cu 50 Zr 50 ) were prepared from pure elements by arc melting furnace under Ar atmosphere. Each ingot was melted several times in order to obtain a good homogeneity.Thermal analysis was performed using a Setaram HTDSC. The sample was contained in an alumina pan with some alumina powder, in order to prevent the sticking of the liquid alloy to the crucible walls. For high temperature measurements, the calorimetric cell was evacuated and purged several times before measuring under flowing He. Calibration of the instrument has been performed from the melting temperature and heat of fusion of pure metals (Al, Ag, Au, Fe, Cu, Ni).

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Unit cell determination in CuZr martensite by electron microscopy and X-ray diffraction

Cited by 134 publications

References 9 publications

Peculiarities of the martensitic transformation in ZrCu intermetallic compound - potential high temperature SMA

Peculiarities of the martensitic transformation in ZrCu intermetallic compound - potential high temperature SMA

Electron Microscopy Studies of Martensite Microstructures

Analysis of Melting and Solidification Behaviour of Glass‐forming Alloys by Synchrotron Radiation

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