Decomposition of Fe-Ni martensite: Implications for the low-temperature (≤500 °C) Fe-Ni phase diagram

Zhang, J.; Williams, David B.; Goldstein, Joseph I.

doi:10.1007/bf02668528

Cited by 27 publications

(20 citation statements)

References 14 publications

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“…The Ni concentration profile in kamacite is replotted in the inset using a different Ni scale. (Zhang et al, 1993(Zhang et al, , 1994. If this process is applicable, then the computer simulation model must be changed to simulate martensite decomposition during cooling.…”

Section: Discussionmentioning

confidence: 99%

“…1). In this scenario, the growth of tetrataenite is controlled by fast diffusion of Ni through the decomposing a2, distorted bcc, martensite (Zhang et al, 1993(Zhang et al, , 1994. This is the same transformation path for the formation of decomposed duplex plessite in iron meteorites (Zhang et al, 1994).…”

Section: Application To Mesosideritesmentioning

confidence: 96%

“…In this scenario, the growth of tetrataenite is controlled by fast diffusion of Ni through the decomposing a2, distorted bcc, martensite (Zhang et al, 1993(Zhang et al, , 1994. This is the same transformation path for the formation of decomposed duplex plessite in iron meteorites (Zhang et al, 1994). Although we do not have definitive evidence for either explanation of why the current model, y a + y, does not accurately predict the central nickel content of taenite halfwidths smaller than -10 p m , one can make certain observations using EPMA traces measured across Widmanstatten pattern regions in mesosiderites.…”

Section: Application To Mesosideritesmentioning

confidence: 99%

“…1). The growth of y or y" precipitates at martensite lath boundaries is due to diffusion control or at lower temperatures to partial interface control (Zhang et al, 1993(Zhang et al, , 1994. Continued cooling allows y" to order forming FeNi, tetrataenite, below 3 10 "C.…”

Section: Application To Mesosideritesmentioning

confidence: 99%

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The metallographic cooling rate method revised: Application to iron meteorites and mesosiderites

Hopfe

Goldstein

2001

Meteorit & Planetary Scien

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Section: Discussionmentioning

confidence: 99%

Section: Application To Mesosideritesmentioning

confidence: 96%

Section: Application To Mesosideritesmentioning

confidence: 99%

Section: Application To Mesosideritesmentioning

confidence: 99%

See 2 more Smart Citations

The metallographic cooling rate method revised: Application to iron meteorites and mesosiderites

Hopfe

Goldstein

2001

Meteorit & Planetary Scien

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“…Furthermore, this transformation is known to induce large shear stresses that in turn generate a huge density of lattice defects (dislocations, point defects; Paterson and Wayman, 1966;Romig and Goldstein, 1981;Zhang et a/., 1994a). The Fe-Ni alloys with a Ni content in the range 7 to 15% have been shown to transform into martensite grains with a lath-shaped texture consisting of elongated subgrains (laths) slightly misoriented with respect to one another (e.g., McDougall and Wayman, 1992).…”

Section: Tsarevmentioning

confidence: 99%

Microstructures of metal grains in ordinary chondrites: Implications for their thermal histories

Leroux¹,

Doukhan²,

Perron

2000

Meteorit & Planetary Scien

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Abstract-This paper reports one of the first attempts to investigate by analytical transmission electron microscopy (ATEM) the microstructures and compositions of Fe-Ni metal grains in ordinary chondrites. Three ordinary chondrites, Saint Severin (LL6), Agen (H5), and Tsarev (L6) were selected because they display contrasting microstructures, which reflects different thermal histories.In Saint Severin, the microstructure of the Ni-rich metal grains is due to slow cooling. It consists of a two-phase assemblage with a honeycomb structure resulting from spinodal decomposition similar to the cloudy zone of iron meteorites. Microanalyses show that the Ni-rich phase is tetrataenite (Ni = 47 wt%) and the Ni-poor phase, with a composition of -25% Ni, is either martensite or taenite, these two occurring adjacent to each other. The observation that the Ni-poor phase is partly fcc resolves the disagreement between previous transmission electron microscopy (TEM) and Mossbauer studies on iron meteorites and ordinary chondrite metal. The Ni content of the honeycomb phase is much higher than in mesosiderites, confirming that mesosiderites cooled much more slowly. The high-Ni tetrataenite rim in contact with the cloudy zone displays high-Ni compositional variability on a very fine scale, which suggests that the corresponding area was destabilized and partially decomposed at low temperature.Both Agen and Tsarev display evidence of reheating and subsequent fast cooling obviously related to shock events. Their metallic particles mostly consist of martensite, the microstructure of which depends on local Ni content. Microstructures are controlled by both the temperature at which martensite forms and that at which it possibly decomposes. In high-Ni zones (>15 wt%), martensitic transformation started at low temperature (<300 "C). Because no further recovery occurred, these zones contain a high density of lattice defects. In low-Ni zones (

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A revision of the Fe-Ni phase diagram at low temperatures (<400 °C)
Yang
¹
,
Williams
²
,
Goldstein
³

1996
JPE
188
3
132
1
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Decomposition of Fe-Ni martensite: Implications for the low-temperature (≤500 °C) Fe-Ni phase diagram

Cited by 27 publications

References 14 publications

The metallographic cooling rate method revised: Application to iron meteorites and mesosiderites

The metallographic cooling rate method revised: Application to iron meteorites and mesosiderites

Microstructures of metal grains in ordinary chondrites: Implications for their thermal histories

A revision of the Fe-Ni phase diagram at low temperatures (<400 °C)

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