Rapid eutectic growth in undercooled Al-Ge alloy under free fall condition

被引：0
|
作者：
Liu, XR [1 ]
Cao, CD [1 ]
Wei, BB [1 ]
机构：
[1] Northwestern Polytech Univ, Dept Appl Phys, Xian 710072, Peoples R China
来源：
CHINESE PHYSICS | 2003年 / 12卷 / 11期
关键词：
growth; morphology; undercooling; coupled zone; free fall;
D O I：
暂无
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
fEutectic growth in Al-51.6%wt Ge alloy has been investigated during free fall in a drop tube. With decreasing undercooling DeltaT, the microstructural evolution has shown a transition from lamellar eutectic to anomalous eutectic. A maximum cooling rate of 4.2x10(4)K/s and undercooling of up to 240K (0.35T(E)) are obtained in the experiment. The eutectic coupled zone is calculated on the basis of current eutectic and dendritic growth theories, which covers a composition range from 48%-59% Ge and leans towards the Ge-rich side. The two critical undercoolings for the eutectic transition are DeltaT(1)*=101K and DeltaT(2)*=178K. When DeltaT less than or equal to DeltaT(1)*, the microstructure for Al-51.6% Ge eutectic shows lamellar eutectic. If DeltaT greater than or equal to DeltaT(2)*, the microstructure shows anomalous eutectic. In the intermediate range of DeltaT(1)* < DeltaT < DeltaT(2)*, the microstructure is the mixture of the above two types of eutectics.
引用
收藏
页码：1266 / 1271
页数：6
相关论文
共 50 条
  • [31] Effects of trace elements (Y and Ca) on the eutectic Ge in Al-Ge based alloys
    Li, J. H.
    Wanderka, N.
    Balogh, Z.
    Stender, P.
    Kropf, H.
    Albu, M.
    Tsunekawa, Y.
    Hofer, F.
    Schmitz, G.
    Schumacher, P.
    ACTA MATERIALIA, 2016, 111 : 85 - 95
  • [32] PHASE-TRANSITION IN AN AMORPHOUS AL-GE ALLOY
    LEREAH, Y
    DEUTSCHER, G
    GRUNBAUM, E
    ULTRAMICROSCOPY, 1985, 17 (02) : 160 - 161
  • [33] Shape Refinement of Ge Precipitates in an Al-Ge Alloy by Thermal Cycling
    Hinderberger, Stefan
    Dahmen, Ulrich
    Xiao, Siqun
    Westmacott, Kenneth H.
    International Journal of Materials Research, 2000, 91 (03) : 215 - 220
  • [34] THE NATURE OF METASTABLE PHASE FORMATION IN THE MICROSECOND PULSED LASER-MELTED POOL OF AL-GE EUTECTIC ALLOY
    SWAMY, VT
    CHATTOPADHYAY, K
    RANGANATHAN, S
    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1990, 123 (02): : 247 - 254
  • [35] Nature of metastable phase formation in the microsecond pulsed laser-melted pool of Al-Ge eutectic alloy
    Swamy, V.T.
    Chattopadhyay, K.
    Ranganathan, S.
    Materials Science and Engineering A, 1990, A123 (02) : 247 - 254
  • [36] Ternary eutectic growth in a highly undercooled liquid alloy
    Ruan, Y
    Wang, N
    Cao, CD
    Wei, BB
    CHINESE PHYSICS LETTERS, 2004, 21 (08) : 1590 - 1592
  • [37] ANALYSIS OF IN SITU RAPID SOLIDIFICATION OF SUBMICRON Al-Ge EUTECTIC POWDERS USING TRANSMISSION ELECTRON MICROSCOPY.
    Kaufman, M.J.
    Fraser, H.L.
    Metallurgical transactions. A, Physical metallurgy and materials science, 1983, 14 A (03): : 623 - 633
  • [38] Structure, microhardness, and strength of a directionally crystallized Al-Ge alloy
    L. I. Derkachenko
    B. N. Korchunov
    S. P. Nikanorov
    V. N. Osipov
    V. V. Shpeizman
    Physics of the Solid State, 2014, 56 : 527 - 530
  • [39] CHARACTERIZATION OF METASTABLE CRYSTALLINE PHASES IN THE AL-GE ALLOY SYSTEM
    KAUFMAN, MJ
    FRASER, HL
    ACTA METALLURGICA, 1985, 33 (02): : 191 - 203
  • [40] Structure, microhardness, and strength of a directionally crystallized Al-Ge alloy
    Derkachenko, L. I.
    Korchunov, B. N.
    Nikanorov, S. P.
    Osipov, V. N.
    Shpeizman, V. V.
    PHYSICS OF THE SOLID STATE, 2014, 56 (03) : 527 - 530
12345