Al–Ti–B grain refiners via powder metallurgy processing of Al/K2TiF6/KBF4 powder blends |
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Authors: | Yucel Birol |
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Affiliation: | aMaterials Institute, Marmara Research Center, TUBITAK, 41470 Kocaeli, Turkey |
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Abstract: | The response to thermal exposure of ball-milled Al/K2TiF6/KBF4 powder blends was investigated to explore the potential of PM processing for the manufacture of Al–Ti–B alloys. K2TiF6 starts to be reduced by aluminium as early as 220 °C when ball-milled Al/K2TiF6/KBF4 powder blends are heated. The reaction of KBF4 with aluminium follows soon after. The Ti and B thus produced are both solutionized in aluminium before precipitating out as Al3Ti and TiB2. All these reactions take place below the melting point of aluminium. The ball-milled Al/K2TiF6/KBF4 powder blends heat treated at approximately 525 °C can be compacted to produce Al–Ti–B pellets with in situ formed Al3Ti and TiB2 particles. These pellets are shown to be adequate grain refiners for aluminium alloys. |
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Keywords: | Metals Powder metallurgy Thermal analysis Al– Ti– B alloy |
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