Dislocation reactions responsible for the formation of a twin in the ordered intermetallic alloy Ni-20A1-30Fe

Diane E. Albert; George Thompson Gray

doi:10.1080/01418619508244463

Dislocation reactions responsible for the formation of a twin in the ordered intermetallic alloy Ni-20A1-30Fe

Diane E. Albert
, George Thompson Gray

Los Alamos National Laboratory

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Twins have been studied in an undeformed sample of the ordered L1₂ alloy Ni-20Al-30Fe. One twin/matrix boundary was seen to have “steps”. A dislocation mechanism is proposed, whereby Shockley partial dislocations of three different types move in a coordinated manner on adjacent (111) type planes to form twins in Ni₃Al; this glide plane is also the twinning plane. A local, but not global, stress is created by this type of dislocation motion. Preliminary measurements of the thickness of each of the “steps” have been made. It is proposed that the “steps” thicknesses correspond to the thickness of multiples of three (111) type planes.

Original language	English
Pages (from-to)	473-487
Number of pages	15
Journal	Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume	71
Issue number	3
DOIs	https://doi.org/10.1080/01418619508244463
State	Published - Mar 1995

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title = "Dislocation reactions responsible for the formation of a twin in the ordered intermetallic alloy Ni-20A1-30Fe",

abstract = "Twins have been studied in an undeformed sample of the ordered L12 alloy Ni-20Al-30Fe. One twin/matrix boundary was seen to have {\textquotedblleft}steps{\textquotedblright}. A dislocation mechanism is proposed, whereby Shockley partial dislocations of three different types move in a coordinated manner on adjacent (111) type planes to form twins in Ni3Al; this glide plane is also the twinning plane. A local, but not global, stress is created by this type of dislocation motion. Preliminary measurements of the thickness of each of the {\textquotedblleft}steps{\textquotedblright} have been made. It is proposed that the {\textquotedblleft}steps{\textquotedblright} thicknesses correspond to the thickness of multiples of three (111) type planes.",

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year = "1995",

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T1 - Dislocation reactions responsible for the formation of a twin in the ordered intermetallic alloy Ni-20A1-30Fe

AU - Albert, Diane E.

AU - Gray, George Thompson

PY - 1995/3

Y1 - 1995/3

N2 - Twins have been studied in an undeformed sample of the ordered L12 alloy Ni-20Al-30Fe. One twin/matrix boundary was seen to have “steps”. A dislocation mechanism is proposed, whereby Shockley partial dislocations of three different types move in a coordinated manner on adjacent (111) type planes to form twins in Ni3Al; this glide plane is also the twinning plane. A local, but not global, stress is created by this type of dislocation motion. Preliminary measurements of the thickness of each of the “steps” have been made. It is proposed that the “steps” thicknesses correspond to the thickness of multiples of three (111) type planes.

AB - Twins have been studied in an undeformed sample of the ordered L12 alloy Ni-20Al-30Fe. One twin/matrix boundary was seen to have “steps”. A dislocation mechanism is proposed, whereby Shockley partial dislocations of three different types move in a coordinated manner on adjacent (111) type planes to form twins in Ni3Al; this glide plane is also the twinning plane. A local, but not global, stress is created by this type of dislocation motion. Preliminary measurements of the thickness of each of the “steps” have been made. It is proposed that the “steps” thicknesses correspond to the thickness of multiples of three (111) type planes.

UR - https://www.scopus.com/pages/publications/21844526256

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DO - 10.1080/01418619508244463

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JO - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties

JF - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties

IS - 3

ER -

Dislocation reactions responsible for the formation of a twin in the ordered intermetallic alloy Ni-20A1-30Fe

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