Effect of Nb-addition on the thermal stability of rapidly solidified Al-Cr-Zr alloys.
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The influence of niobium on the L12 structure phase and thus on the thermal stability of the alloys was investigated for four melt-spun Al-Cr-Zr-Nb alloys; three alloys contain about 4vol% of L12-Al3 (ZrxNb1-x) precipitate with different Zr/Nb ratios and one alloy contains about 8vol% of L12 precipitate. The microstructures of as-spun ribbons were characterized using an optical microscope and scanning transmission electron microscope. DSC and microhardness tests indicated that the alloys aged at 723 and 773K showed excellent thermal stability after annealing at 648 and 673K for up to 1000h. The Al-3.14Cr-4.03Zr-1.95Nb alloy, for example, attains microhardness of 204kgf/mm2 in agehardened condition and retains 93% of that value, i. e. 190kgf/mm2, after annealing at 648K for 1000h. Microstructural changes during annealing were identified and correlated with the microhardness data. The coarsening rate of the L12 structure precipitate is very slow at the test temperatures. The coarsening kinetics of the L12 structure Al3(Zr2/3 Nb1/3) precipitate in the Al-3.14Cr-4.03Zr-1.95Nb alloy were studied at 648, 673 and 723K. Antiphase boundary evolved inside the L12 particles during annealing at 723K.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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