Role of matrix microstructure on room-temperature tensile properties and fiber-strength utilization of an orthorhombic ti-alloy-based composite

C. J. Boehlert, B. S. Majumdar, S. Krishnamurthy, D. B. Miracle

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Abstract

Microstructure-property understanding obtained for a nominally Ti-25Al-17Nb (at. pct) monolithic sheet alloy was used to heat treat a unidirectional four-ply SCS-6/Ti-25Al-17Nb metal-matrix composite (MMC) and a fiberless "neat" material of the same alloy for enhancing mechanical properties. The unreinforced alloy and [0]4 composite recorded significant improvements in ductility and strength, which were related to the microstructural condition. Modeling of the tensile strength based on fiber fracture statistics helped in understanding how improved matrix microstrucrure provided more efficient utilization of fiber strength. In comparison to the [0]4 MMC, improvement of the [90]4 response was negligible, which was related to an α2 stabilized zone around the fiber. A Nb coating on the fiber was used to modify the local microstructure, and it produced a modest improvement in strength and ductility in the transverse direction. Structure-property relations of the matrix under different heat-treatment conditions are described in terms of deformation and failure mechanisms of the constituent phases; α2 (ordered hexagonal close-packed), B2 (ordered body-centered cubic), and O (ordered orthorhombic based on Ti2AlNb).

Original languageEnglish (US)
Pages (from-to)309-323
Number of pages15
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume28
Issue number2
StatePublished - 1997
Externally publishedYes

Profile

Enzyme Reactivators
Abnormal Erythrocytes
Fibers
Composite materials
microstructure
fibers
matrices
Microstructure
fiber strength
metal matrix composites
ductility
composite materials
Ductility
Metals
tensile properties
tensile strength
heat treatment
statistics
mechanical properties
coatings

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

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title = "Role of matrix microstructure on room-temperature tensile properties and fiber-strength utilization of an orthorhombic ti-alloy-based composite",
abstract = "Microstructure-property understanding obtained for a nominally Ti-25Al-17Nb (at. pct) monolithic sheet alloy was used to heat treat a unidirectional four-ply SCS-6/Ti-25Al-17Nb metal-matrix composite (MMC) and a fiberless {"}neat{"} material of the same alloy for enhancing mechanical properties. The unreinforced alloy and [0]4 composite recorded significant improvements in ductility and strength, which were related to the microstructural condition. Modeling of the tensile strength based on fiber fracture statistics helped in understanding how improved matrix microstrucrure provided more efficient utilization of fiber strength. In comparison to the [0]4 MMC, improvement of the [90]4 response was negligible, which was related to an α2 stabilized zone around the fiber. A Nb coating on the fiber was used to modify the local microstructure, and it produced a modest improvement in strength and ductility in the transverse direction. Structure-property relations of the matrix under different heat-treatment conditions are described in terms of deformation and failure mechanisms of the constituent phases; α2 (ordered hexagonal close-packed), B2 (ordered body-centered cubic), and O (ordered orthorhombic based on Ti2AlNb).",
author = "Boehlert, {C. J.} and Majumdar, {B. S.} and S. Krishnamurthy and Miracle, {D. B.}",
year = "1997",
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journal = "Metallurgical Transactions A (Physical Metallurgy and Materials Science)",
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AU - Majumdar,B. S.

AU - Krishnamurthy,S.

AU - Miracle,D. B.

PY - 1997

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AB - Microstructure-property understanding obtained for a nominally Ti-25Al-17Nb (at. pct) monolithic sheet alloy was used to heat treat a unidirectional four-ply SCS-6/Ti-25Al-17Nb metal-matrix composite (MMC) and a fiberless "neat" material of the same alloy for enhancing mechanical properties. The unreinforced alloy and [0]4 composite recorded significant improvements in ductility and strength, which were related to the microstructural condition. Modeling of the tensile strength based on fiber fracture statistics helped in understanding how improved matrix microstrucrure provided more efficient utilization of fiber strength. In comparison to the [0]4 MMC, improvement of the [90]4 response was negligible, which was related to an α2 stabilized zone around the fiber. A Nb coating on the fiber was used to modify the local microstructure, and it produced a modest improvement in strength and ductility in the transverse direction. Structure-property relations of the matrix under different heat-treatment conditions are described in terms of deformation and failure mechanisms of the constituent phases; α2 (ordered hexagonal close-packed), B2 (ordered body-centered cubic), and O (ordered orthorhombic based on Ti2AlNb).

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