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, Do Hyang Kim

Research output: Contribution to journalArticle

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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 languageEnglish
Pages (from-to)173-177
Number of pages5
JournalMaterials Science and Engineering
Volume98
Issue numberC
DOIs
Publication statusPublished - 1988 Jan 1

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Coarsening
Temperature
Grain growth
Hardness
Isothermal annealing
Melt spinning
Hot isostatic pressing
Microhardness
Deterioration
Microstructure
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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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.",
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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. / Whang, S. H.; Park, W. W.; Kim, P. K.; Kim, Do Hyang.

In: Materials Science and Engineering, Vol. 98, No. C, 01.01.1988, p. 173-177.

Research output: Contribution to journalArticle

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AU - Park, W. W.

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AU - Kim, Do Hyang

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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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