Crystals and nanocrystals in rapidly solidified Al-Sm alloys

被引：29
作者：
Rizzi, P
Antonione, C
Baricco, M
Battezzati, L
Armelao, L
Tondello, E
Fabrizio, M
Daolio, S
机构：
[1] Univ Turin, Dipartimento Chim, IFM, I-10125 Turin, Italy
[2] Politecn Torino, Dipartimento Ingn Chim & Sci Mat, I-10129 Turin, Italy
[3] Univ Padua, Dipartimento Chim Inorgan Met Organ & Analit, I-35131 Padua, Italy
[4] CNR, CSSRCC, I-35131 Padua, Italy
[5] CNR, Ist Polarog & Elettrochim Preparat, I-35127 Padua, Italy
来源：
NANOSTRUCTURED MATERIALS | 1998年 / 10卷 / 05期
关键词：
D O I：
10.1016/S0965-9773(98)00114-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The formation, size and morphology of crystals in Al(100-x)Sm(x) (8<x<12) alloys either melt spun or crystallized from the glass was analyzed with SEM, AFM, TEM, DSC, XPS, SIMS. AFM and SEM show crytalline fractions even in some ribbons appearing amorphous at XRD. On the surface which was in contact with the wheel, colonies of crystals were found, apparently nucleated on heterogeneities. In Al(92)Sm(8) they were identified as a-Al, in Al(88)Sm(12) and Al(90)Sm(10) as Al(11)Sm(3). On the opposite surface of Al(92)Sm(8) ribbons, AFM reveals crytals of 100-200 nm, regularly distributed, nucleated in the undercooling regime. In glass samples annealed between 423 K and 444 K, TEM shows nanocrystals reaching a density of 10(22) m(-3) in less than a minute with maximum size of 20 nm. The isothermal transformed fraction indicates a two step process of crystallization. The findings are discussed considering nucleation in various temperature ranges. (C) 1998 Acta Metallurgica Inc.
引用
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页码：767 / 776
页数：10
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共 13 条
  • [1] Thermodynamics of homogeneous crystal nucleation in Al-RE metallic glasses
    Baricco, M
    Gaertner, F
    Cacciamani, G
    Rizzi, P
    Battezzati, L
    Greer, AL
    [J]. MECHANICALLY ALLOYED, METASTABLE AND NANOCRYSTALLINE MATERIALS, PART 2, 1998, 269-2 : 553 - 558
  • [2] CRYSTALLIZATION BEHAVIOR OF AL-SM AMORPHOUS-ALLOYS
    BATTEZZATI, L
    BARICCO, M
    SCHUMACHER, P
    SHIH, WC
    GREER, AL
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1994, 179 (pt 1): : 600 - 604
  • [3] Nanocrystallization of Al-Ni-Y and Al-Ni-Nd metallic glasses
    Calin, M
    Koster, U
    [J]. MECHANICALLY ALLOYED, METASTABLE AND NANOCRYSTALLINE MATERIALS, PART 2, 1998, 269-2 : 749 - 754
  • [4] GUO JQ, 1993, 4 INT C AL ALL ATL, V2, P753
  • [5] SOLUTE PARTITIONING IN PARTIALLY CRYSTALLIZED AL-NI-CE(-CU) METALLIC GLASSES
    HONO, K
    ZHANG, Y
    TSAI, AP
    INOUE, A
    SAKURAI, T
    [J]. SCRIPTA METALLURGICA ET MATERIALIA, 1995, 32 (02): : 191 - 196
  • [6] NEW AMORPHOUS-ALLOYS WITH GOOD DUCTILITY IN AL-Y-M AND AL-LA-M (M=FE, CO, NI OR CU) SYSTEMS
    INOUE, A
    OHTERA, K
    TSAI, AP
    MASUMOTO, T
    [J]. JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 1988, 27 (03): : L280 - L282
  • [7] Particle-size effects in primary crystallization of amorphous Al-Ni-Y alloys
    Jiang, XY
    Zhong, ZC
    Greer, AL
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1997, 226 : 789 - 793
  • [8] THE THERMODYNAMIC FACTOR IN INTERDIFFUSION - A STRONG EFFECT IN AMORPHOUS NI-ZR
    KARPE, N
    KROG, JP
    BOTTIGER, J
    CHECHENIN, NG
    SOMEKH, RE
    GREER, AL
    [J]. ACTA METALLURGICA ET MATERIALIA, 1995, 43 (02): : 551 - 558
  • [9] The crystallization of Al-Sm amorphous alloys
    Rizzi, P
    Baricco, M
    Battezzati, L
    Schumacher, P
    Greer, AL
    [J]. NANOPHASE MATERIALS, 1995, 195 : 111 - 116
  • [10] Kinetics of formation of Al nanocrystals from amorphous Al-Sm alloys
    Rizzi, P
    Baricco, M
    Battezzati, L
    Schumacher, P
    Greer, AL
    [J]. SYNTHESIS AND PROPERTIES OF MECHANICALLY ALLOYED AND NANOCRYSTALLINE MATERIALS, PTS 1 AND 2 - ISMANAM-96, 1997, 235-2 : 409 - 414
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