Crystallography of the Delta to Alpha Martensitic Transformation in Plutonium Alloys

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A new stress-accommodating crystallographic mechanism of the {delta} {yields} {alpha} martensitic transformation in plutonium alloys is proposed. According to this mechanism, an orientation variant of the {alpha} phase is produced by a combination of a homogeneous strain and shuffling of the alternating close-packed (111){sub {delta}} planes. It is shown that the formation of stable transformation-induced twins whose twin plane orientations and twin shear directions do not depend on the small variations of the crystal lattice parameters is the preferred stress-accommodating mode. Only these stable twins have dislocation-free twin boundaries while the twin boundaries of all others are decorated by ultra-dense ... continued below

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PDF-file: 35 pages; size: 2.7 Mbytes

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Jin, Y; Wang, Y; Khachaturyan, A; Krenn, C & Schwartz, A July 15, 2004.

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A new stress-accommodating crystallographic mechanism of the {delta} {yields} {alpha} martensitic transformation in plutonium alloys is proposed. According to this mechanism, an orientation variant of the {alpha} phase is produced by a combination of a homogeneous strain and shuffling of the alternating close-packed (111){sub {delta}} planes. It is shown that the formation of stable transformation-induced twins whose twin plane orientations and twin shear directions do not depend on the small variations of the crystal lattice parameters is the preferred stress-accommodating mode. Only these stable twins have dislocation-free twin boundaries while the twin boundaries of all others are decorated by ultra-dense distribution of partial dislocations. The theory predicts a crystal lattice rearrangement mechanism involving the (205){sub {alpha}} ((01{bar 1}){sub {delta}}) stable twins. The corresponding Invariant Plane Strain solutions, with special emphasis on two simplest shuffling modes, the single and double elementary modes, are presented and compared with the existing experimental observations. It is shown that the habit plane orientation is highly sensitive to the input values of the crystal lattice parameters and especially to the accuracy of the measured volume change in the {delta}{yields}{alpha} transformation. An analysis of these effects on the habit plane orientation and orientation relations is also presented.

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PDF-file: 35 pages; size: 2.7 Mbytes

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  • Journal Name: Metallurgical Transactions A; Journal Volume: 36A

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  • Report No.: UCRL-JRNL-205365
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 875369
  • Archival Resource Key: ark:/67531/metadc876694

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 15, 2004

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 23, 2016, 12:09 p.m.

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Jin, Y; Wang, Y; Khachaturyan, A; Krenn, C & Schwartz, A. Crystallography of the Delta to Alpha Martensitic Transformation in Plutonium Alloys, article, July 15, 2004; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc876694/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.