Strontium modification and formation of cubic primary Mg2Si crystals in Mg2Si/Al composite

被引：113
作者：
Qin, Q. D. [1 ,2 ]
Zhao, Y. G. [1 ,2 ]
Liu, C. [1 ,2 ]
Cong, P. J. [1 ,2 ]
Zhou, W. [1 ,2 ]
机构：
[1] Jilin Univ, Key Lab Automobile Mat, Minst Educ, Changchun 130025, Peoples R China
[2] Jilin Univ, Dept Mat Sci & Engn, Changchun 130025, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2008年 / 454卷 / 1-2期
关键词：
modification; magnesium silicide; composites; microstructure; cubic crystals;
D O I：
10.1016/j.jallcom.2006.12.074
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of Sr content on microstructure of Mg2Si/Al composite was investigated by XRD, SEM and extracted technology. The results showed that, with the increase of Sr content, primary Mg2Si morphology changes from dendritic to polygonal and then to quadrangle with a size of similar to 40 mu m. The extracted results indicated that, the unmodified Mg2Si is an assembly of octahedral with a common orientation. However, after 0.1-0.15 wt.% Sr addition, the particle morphology is cubic. Furthermore, there exist some twin crystals and fine crystals. The formation mechanism of cubic Mg2Si particle was discussed. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：142 / 146
页数：5
相关论文
共 16 条
  • [1] STRONTIUM-ALUMINUM AND BARIUM-ALUMINUM SYSTEMS
    BRUZZONE, G
    MERLO, F
    [J]. JOURNAL OF THE LESS-COMMON METALS, 1975, 39 (01): : 1 - 6
  • [2] Fommei F, 1977, ALUMINIO, V46, P121
  • [3] The effect of cooling rate on the morphology of primary Al3Se intermetallic particles in Al-Sc alloys
    Hyde, KB
    Norman, AF
    Prangnell, PB
    [J]. ACTA MATERIALIA, 2001, 49 (08) : 1327 - 1337
  • [4] OHASHI T, 1973, Z METALLKD, V64, P517
  • [5] Microstructure evolution of in situ Mg2Si/Al-Si-Cu composite in semisolid remelting processing
    Qin, QD
    Zhao, YG
    Xiu, K
    Zhou, W
    Liang, YH
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 407 (1-2): : 196 - 200
  • [6] Effects of melt superheating treatment on microstructure Of Mg2Si/Al-Si-Cu composite
    Qin, QD
    Zhao, YG
    Liang, YH
    Zhou, W
    [J]. JOURNAL OF ALLOYS AND COMPOUNDS, 2005, 399 (1-2) : 106 - 109
  • [7] SCHMID EE, 1990, Z METALLKD, V81, P809
  • [8] SIGWORTH GK, 1983, AFS T, V66, P7
  • [9] Faceted growth of silicon crystals in Al-Si alloys
    Wang, RY
    Li, WH
    Hogan, LM
    [J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1997, 28 (05): : 1233 - 1243
  • [10] Watts B. M., 1976, Metal Science, V10, P189
12