镧对Mg-Si合金中Mg2Si相变质的影响

被引：18

作者：

马宝霞

王丽萍

郭二军

机构：

[1] 哈尔滨理工大学材料科学与工程学院

来源：

中国稀土学报 | 2008年 / 01期

关键词：

变质; 镁; 显微组织; Mg2Si; 镧; 稀土;

D O I：

暂无

中图分类号：

TG146.22 [];

学科分类号：

摘要：

研究了Mg-5Si合金中La的添加对初生Mg2Si相变质的影响。结果表明,适量的La能够有效地变质初生Mg2Si相。基于本文的研究,在添加约0.5%La时,获得了最佳的变质效果,此时,初生Mg2Si相的尺寸减小到25μm以下,其形态从粗大的树枝形状变为多面体形状。然而,当La增加到0.8%或者更高时,初生Mg2Si相又生长为粗大的树枝形态。而且,在凝固过程中发现形成了一些LaSi2化合物,这些化合物的数量随着La的增加而呈现逐渐增加的趋势。

引用

页码：87 / 91

页数：5

共 17 条

[1] Sr microalloying for refining grain size of AZ91D magnesium alloy
Pan Yichuan
Liu Xiangfa
Hua, Yang
[J]. JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION, 2007, 22 (01): : 74 - 76
[2] Review of recent studies in magnesium matrix composites
Ye, HZ
Liu, XY
[J]. JOURNAL OF MATERIALS SCIENCE, 2004, 39 (20) : 6153 - 6171
[3] Spray forming of silicon added AZ91 magnesium alloy and its workability
Chen, CY
Tsao, CYA
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 383 (01): : 21 - 29
[4] Microstructures and La-rich compounds in a Cu-containing hypereutectic Al–Si alloy[J] . Hongkun Yi,Di Zhang,T. Sakata,H. Mori.Journal of Alloys and Compounds . 2003 (1)
[5] Tensile behaviour of squeeze cast AM100 magnesium alloy and its Al2O3 fibre reinforced composites
Jayalakshmi, S
Kailas, SV
Seshan, S
[J]. COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, 2002, 33 (08) : 1135 - 1140
[6] Application of a model for the work hardening behavior to Mg/SiC composites synthesized using a fluxless casting process[J] . M Manoharan,S.C.V Lim,M Gupta.Materials Science ＆ Engineering A . 2002 (1)
[7] Creep of magnesium strengthened with high volume fractions of yttria dispersoids[J] . B.Q Han,D.C Dunand.Materials Science ＆ Engineering A . 2001 (1)
[8] Modification of Mg2Si morphology in squeeze cast Mg-Al-Zn-Si alloys by Ca or P addition
Kim, JJ
Kim, DH
Shin, KS
Kim, NJ
[J]. SCRIPTA MATERIALIA, 1999, 41 (03) : 333 - 340
[9] Rare earth concentration in the primary Si crystal in rare earth added Al-21wt.%Si alloy[J] . J.Y. Chang,G.H. Kim,I.G. Moon,C.S. Choi.Scripta Materialia . 1998 (3)
[10] Formaton of nanocrystalline Mg 2 Si and Mg 2 Si dispersion strengthened Mg-Al alloy by mechanical alloying[J] . L. Lu,M.O. Lai,M.L. Hoe.Nanostructured Materials . 1998 (4)

← 1 2 →