Microstructural coarsening at high temperatures in rapidly solidified Ti-5wt.%Al-2.9wt.%Y and Ti-5wt.%Al-7.5wt.%Th

S. H. Whang; W. W. Park; P. K. Kim; D. H. Kim

doi:10.1016/0025-5416(88)90150-4

Microstructural coarsening at high temperatures in rapidly solidified Ti-5wt.%Al-2.9wt.%Y and Ti-5wt.%Al-7.5wt.%Th

S. H. Whang, W. W. Park, P. K. Kim, D. H. Kim

Department of Materials Science and Engineering

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

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Abstract

Rapidly solidified ribbons of Ti-5wt.%Al-2.9wt.%Y and Ti-5wt.%Al-7.5wt.%Th alloys (where the composition is in approximate weight percent) were prepared by the arc melt-spinning technique. These ribbons were chopped and consolidated by hot isostatic pressing at 850 °C for 3 h. The microstructures of both as-quenched alloys are characterized by a uniform dispersion of spherical dispersoids in the matrix. Isothermal annealing of these alloys at 900 °C results in the coarsening of grains and dispersoids. A strong deviation from the parabolic law in the grain growth and dispersoid coarsening is observed in the Ti-5wt.%Al-7.5wt.%Th alloy. Zener's relation for the grain growth and dispersoid coarsening appears to be operational in this case. Microhardness measurements on the isothermally treated alloys show that a significant deterioration in hardness of the 2.9wt.% Y alloy vs. almost no change in hardness of the 7.5wt.%Th alloy may be the most dramatic difference between the two alloys.

Original language	English
Pages (from-to)	173-177
Number of pages	5
Journal	Materials Science and Engineering
Volume	98
Issue number	C
DOIs	https://doi.org/10.1016/0025-5416(88)90150-4
Publication status	Published - 1988 Feb

Bibliographical note

Funding Information:
The authors would like to acknowledge financial support for this research by the Office of Naval Research, VA, under Contract N00014-82-K-0597. Also, we would like to thank Dr. R. Raman for performing hardness tests on the hot isostatically pressed alloys.

All Science Journal Classification (ASJC) codes

Engineering(all)

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10.1016/0025-5416(88)90150-4

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title = "Microstructural coarsening at high temperatures in rapidly solidified Ti-5wt.%Al-2.9wt.%Y and Ti-5wt.%Al-7.5wt.%Th",

abstract = "Rapidly solidified ribbons of Ti-5wt.%Al-2.9wt.%Y and Ti-5wt.%Al-7.5wt.%Th alloys (where the composition is in approximate weight percent) were prepared by the arc melt-spinning technique. These ribbons were chopped and consolidated by hot isostatic pressing at 850 °C for 3 h. The microstructures of both as-quenched alloys are characterized by a uniform dispersion of spherical dispersoids in the matrix. Isothermal annealing of these alloys at 900 °C results in the coarsening of grains and dispersoids. A strong deviation from the parabolic law in the grain growth and dispersoid coarsening is observed in the Ti-5wt.%Al-7.5wt.%Th alloy. Zener's relation for the grain growth and dispersoid coarsening appears to be operational in this case. Microhardness measurements on the isothermally treated alloys show that a significant deterioration in hardness of the 2.9wt.% Y alloy vs. almost no change in hardness of the 7.5wt.%Th alloy may be the most dramatic difference between the two alloys.",

author = "Whang, {S. H.} and Park, {W. W.} and Kim, {P. K.} and Kim, {D. H.}",

note = "Funding Information: The authors would like to acknowledge financial support for this research by the Office of Naval Research, VA, under Contract N00014-82-K-0597. Also, we would like to thank Dr. R. Raman for performing hardness tests on the hot isostatically pressed alloys.",

year = "1988",

month = feb,

doi = "10.1016/0025-5416(88)90150-4",

language = "English",

volume = "98",

pages = "173--177",

journal = "Materials Science and Engineering",

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T1 - Microstructural coarsening at high temperatures in rapidly solidified Ti-5wt.%Al-2.9wt.%Y and Ti-5wt.%Al-7.5wt.%Th

AU - Whang, S. H.

AU - Park, W. W.

AU - Kim, P. K.

AU - Kim, D. H.

N1 - Funding Information: The authors would like to acknowledge financial support for this research by the Office of Naval Research, VA, under Contract N00014-82-K-0597. Also, we would like to thank Dr. R. Raman for performing hardness tests on the hot isostatically pressed alloys.

PY - 1988/2

Y1 - 1988/2

N2 - Rapidly solidified ribbons of Ti-5wt.%Al-2.9wt.%Y and Ti-5wt.%Al-7.5wt.%Th alloys (where the composition is in approximate weight percent) were prepared by the arc melt-spinning technique. These ribbons were chopped and consolidated by hot isostatic pressing at 850 °C for 3 h. The microstructures of both as-quenched alloys are characterized by a uniform dispersion of spherical dispersoids in the matrix. Isothermal annealing of these alloys at 900 °C results in the coarsening of grains and dispersoids. A strong deviation from the parabolic law in the grain growth and dispersoid coarsening is observed in the Ti-5wt.%Al-7.5wt.%Th alloy. Zener's relation for the grain growth and dispersoid coarsening appears to be operational in this case. Microhardness measurements on the isothermally treated alloys show that a significant deterioration in hardness of the 2.9wt.% Y alloy vs. almost no change in hardness of the 7.5wt.%Th alloy may be the most dramatic difference between the two alloys.

AB - Rapidly solidified ribbons of Ti-5wt.%Al-2.9wt.%Y and Ti-5wt.%Al-7.5wt.%Th alloys (where the composition is in approximate weight percent) were prepared by the arc melt-spinning technique. These ribbons were chopped and consolidated by hot isostatic pressing at 850 °C for 3 h. The microstructures of both as-quenched alloys are characterized by a uniform dispersion of spherical dispersoids in the matrix. Isothermal annealing of these alloys at 900 °C results in the coarsening of grains and dispersoids. A strong deviation from the parabolic law in the grain growth and dispersoid coarsening is observed in the Ti-5wt.%Al-7.5wt.%Th alloy. Zener's relation for the grain growth and dispersoid coarsening appears to be operational in this case. Microhardness measurements on the isothermally treated alloys show that a significant deterioration in hardness of the 2.9wt.% Y alloy vs. almost no change in hardness of the 7.5wt.%Th alloy may be the most dramatic difference between the two alloys.

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Microstructural coarsening at high temperatures in rapidly solidified Ti-5wt.%Al-2.9wt.%Y and Ti-5wt.%Al-7.5wt.%Th

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