Al-Pd-Mn Icosahedral Quasicrystal Prepared by Floating Zone Melting Technique

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著者

    • TSUREKAWA Sadahiro
    • Department of Materials Science and Technology, Graduate School of Engineering Science, Kyushu University
    • YOSHIDA Fuyuki
    • Department of Materials Science and Technology, Graduate School of Engineering Science, Kyushu University
    • NAKASHIMA Hideharu
    • Department of Materials Science and Technology, Graduate School of Engineering Science, Kyushu University

抄録

We tried to grow Al–Pd–Mn icosahedral quasicrystal (IQC) by floating zone melting technique. Molten block of Al<SUB>73.2</SUB>Pd<SUB>19.8</SUB>Mn<SUB>7.0</SUB> at around 1140 K was travelled through a bar of Al<SUB>69.4</SUB>Pd<SUB>20.3</SUB>Mn<SUB>10.3</SUB> at the rate of 1.1 to 14 μm/s. The sample obtained (about 1 cm in diameter and about 6 cm in length) was cut in several slices and some of them were annealed at 1073 K for 20 hr in evacuated state. The bulk composition of the sample was Al<SUB>69.6</SUB>Pd<SUB>20.3</SUB>Mn<SUB>10.1</SUB> and almost unchanged along the growth direction. The largest grain was about 5 mm in diameter and several tens of mm along the growth direction. The sample was made mainly of IQC of Al<SUB>69.8</SUB>Pd<SUB>21.4</SUB>Mn<SUB>8.8</SUB>, and a small amount of decagonal quasicrystal (DQC) of Al<SUB>68.6</SUB>Pd<SUB>13.3</SUB>Mn<SUB>18.1</SUB> was seen as fine exsolution lamellae and grain boundary phase. The electron diffraction pattern taken along the two-fold symmetry axis showed that our IQC is F1 type of Ishimasa and Mori (1992). Micro-Vickers hardness (<I>H<SUB>V</SUB></I>) was about 950 at 25 g, irrespective of annealed or as-solidified and of the presence or absence of DQC lamellae. <I>H<SUB>V</SUB></I> decreased with increasing load, as reported formerly. The fracture toughness (<I>K<SUB>IC</SUB></I>) of annealed sample with lamellae (2.1 MPam<SUP>1⁄2</SUP>) was about 1.5 times as large as that of annealed one without lamellae (1.3 MPam<SUP>1⁄2</SUP>) and as-solidified one with lamellae (1.4 MPam<SUP>1⁄2</SUP>).

収録刊行物

  • Materials transactions, JIM  

    Materials transactions, JIM 37(3), 448-453, 1996-03 

    The Japan Institute of Metals

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