Crystallography of the δ→α martensitic transformation in plutonium alloys

Jin, Yongmei M.; Khachaturyan, A. G.; Wang, Yu U.; Krenn, C. R.; Schwartz, Adam J.

doi:10.1007/s11661-005-0324-8

Cited by 15 publications

(12 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…High resolution TEM revealed that the α′ / δ interface is composed of a terrace and ledge structure that is faceted on {111} δ , in line with the topological model discussed by Hirth et al [18]. A number of studies, beginning with Choudhry and Crocker [53], then Olson and Adler [54], and Jin et al [55] applied theories of martensite crystallography to determine the habit plane of the α′ particles in the δ matrix. Most of these studies predicted a {123} δ habit plane with 24 variants, whereas optical metallography revealed only 4 variants, possibly implying a {111} δ habit plane.…”

Section: The δ → α′ Isothermal Martensitic Transformationsupporting

confidence: 62%

Opportunities in Plutonium Metallurgical Research*

Schwartz

2006

MRS Proc.

Self Cite

View full text Add to dashboard Cite

This is an exciting time to be involved in plutonium metallurgical research. Over the past few years, there have been significant advances in our understanding of the fundamental materials science of this unusual metal, particularly in the areas of self-irradiation induced aging of Pu, the equilibrium phase diagram, the homogenization of δ-phase alloys, the crystallography and morphology of the α'-phase resulting from the isothermal martensitic phase transformation, and the phonon dispersion curves, among many others. In addition, tremendous progress has been made, both experimentally and theoretically, in our understanding of the condensed matter physics and chemistry of the actinides, particularly in the area of electronic structure. Although these communities have made substantial progress, many challenges still remain. This brief overview will address a number of important challenges that we face in fully comprehending the metallurgy of Pu with a specific focus on aging and phase transformations.

show abstract

Section: The δ → α′ Isothermal Martensitic Transformationsupporting

confidence: 62%

Opportunities in Plutonium Metallurgical Research*

Schwartz

2006

MRS Proc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The calculations of Jin et al [22] showed that the (205) a¢ twin is the energetically preferred twin (for their variants 1 and 4). While these calculations do not show that the twist minimizes the invariant plane strain, it probably does minimize interface energy.…”

Section: Twin Relationship In A¢mentioning

confidence: 99%

Orientation Relationship, Habit Plane, Twin Relationship, Interfacial Structure, and Plastic Deformation Resulting from the δ → α′ Isothermal Martensitic Transformation in Pu-Ga Alloys

Moore

Krenn

Wall

et al. 2007

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

The orientation relationship, habit plane, parent-product interface at the atomic level, twin relationship, and plastic deformation resulting from the d fi a¢ isothermal martensitic transformation in Pu-Ga alloys are examined using optical microscopy, transmission electron microscopy (TEM), and finite element calculations. The d fi a¢ transformation exhibits ã 20 vol pct collapse when the fcc d phase transforms to the monoclinic a¢ phase, which results in unique and intriguing crystallography and morphology. Here, we show that the orientation relationship is very close to that previously reported by Zocco et al. (1990), but has small rotational misalignments between the two phases both parallel and perpendicular to the 110 ½ d jj 100 ½ a 0 direction. The amount of plastic deformation is exceedingly large due to thẽ 20 vol pct collapse, and TEM is used to quantify the difference in dislocation density between untransformed d matrix and regions of d adjacent to the transformed a¢. The twins contained in a¢ plates are shown to have a (205) a orientation as the lattice invariant deformation and are found to be composed of two alternating variants that share a common <020> a¢ direction, but differ by a 60 deg rotation about <020> a¢ . A combination of electron diffraction and optical microscopy has been employed to examine the macroscopic habit plane, and the analysis suggests that a large fraction of the observed habit planes are on or near {111} d . Finally, high resolution TEM reveals that the interface is faceted on {111} d exhibiting a series of terrace and ledges.

show abstract

“…2. La deformación que permite la obtención de las dimensiones correctas de la estructura cristalina es conocida como la deformación de Bain [16]. Fig.…”

Section: Deformación De Bainunclassified

Teoría cristalográfica de la transformación martensítica

Torres-López

Arbeláez-Toro

Hincapie

2014

TecnoL.

View full text Add to dashboard Cite

La transformación martensítica es uno de los temas más investigados en la ciencia de los materiales durante el siglo XX. Precisamente la segunda parte de ese siglo se destacó por el desarrollo de diversas teorías relacionadas con la cinética de la transformación de esta fase, los mecanismos de nucleación y la forma como se produce el cambio de la estructura cristalina. En este trabajo se realiza la descripción de los diferentes conceptos que definen la cristalografía de la transformación martensítica, centrándose en la construcción y aplicación de los modelos cristalográficos más destacados: el modelo de Bain; el modelo de Wechsler, Lieberman y Read; y el modelo de Bowles y Mackenzie. Este desarrollo será realizado con base en características particulares de la transformación martensítica como su carácter no difusional, el tipo de intercara entre la fase madre (austenita) y la fase producto (martensita), la formación de la subestructura de defectos y el cambio de forma; todas estas descritas por medio de ecuaciones matemáticas que buscan predecir cómo se dará la transformación, más que en explicar el movimiento real de los átomos dentro de la estructura. Este desarrollo es conocido como la Teoría Fenomenológica de la Cristalografía de la Martensita (TFCM).

show abstract

Crystallography of the δ→α martensitic transformation in plutonium alloys

Cited by 15 publications

References 18 publications

Opportunities in Plutonium Metallurgical Research*

Opportunities in Plutonium Metallurgical Research*

Orientation Relationship, Habit Plane, Twin Relationship, Interfacial Structure, and Plastic Deformation Resulting from the δ → α′ Isothermal Martensitic Transformation in Pu-Ga Alloys

Teoría cristalográfica de la transformación martensítica

Contact Info

Product

Resources

About