Microstructure evolution and nucleation kinetics of rapidly solidified Mg7ZnxY(0.55Zr) alloys

被引：0

作者：

Zhu, Shijie ^{[1
]}

Guan, Shaokang ^{[1
]}

Yang, Qing ^{[1
]}

Zhang, Mei ^{[1
]}

Bai, Xiaobo ^{[1
]}

Wang, Liguo ^{[1
]}

Sun, Yufeng ^{[1
]}

机构：

[1] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450002, Peoples R China

来源：

MAGNESIUM TECHNOLOGY 2008 | 2008年

关键词：

Mg7ZnxY(0.55Zr) alloy; rapid solidification; microstructure; nucleation kinetics;

D O I：

暂无

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effects of solidifying condition and Y content on the microstructural evolution, phase selection and nucleation kinetics of Mg7ZnxY(0.55Zr) alloys were investigated with OM, SEM, XRD, DSC and TEM. The microstructures of the as-cast alloys have a dendritic morphology including preliminary alpha-Mg, interdendritic alpha-Mg/I-phase (Mg3YZn6) eutectic and W-phase (Mg3Y2Zn3). Microstructures of the cross section of rapidly solidified (RS) alloy ribbons are composed of fine equiaxed, columnar grain and equiaxed region. The phase composition changes with the variation of alloying component and solidification conditions. RS Mg7Zn3Y, Mg7Zn3Y0.55Zr alloy ribbons restrain the precipitation of Mg3YZn6 phase. On the basis of heterogeneous nucleation theory, the connection between incubation period (T) and temperature was induced and the curve of,E-T was obtained. The results show the second-phase of RS Mg7ZnxY(0.55Zr) alloy nucleate first, which agree with the experimental results.

引用

页码：299 / 304

页数：6

共 16 条

[1] Environmental behavior of magnesium and magnesium alloys
Alves, H
Koster, U
Aghion, E
Eliezer, D
[J]. MATERIALS TECHNOLOGY, 2001, 16 (02) : 110 - 126
[2] Baghni IM, 2003, T NONFERR METAL SOC, V13, P1253
[3] CAHILL CA, 1965, J PHYS CHEM-US, V69, P518
[4] CHEN GH, 2004, CHEM IND ENG PROGR, V23, P816
[5] Chen GL, 2005, FOUNDRY TECHNOLOGY, V26, P963
[6] Guo X., 2002, FOUNDRY TECHNOLO, V23, P133, DOI [10.3969/j.issn.1000-8365.2002.03.001, DOI 10.3969/J.ISSN.1000-8365.2002.03.001]
[7] Effects of Zn/Y ratio on microstructure and mechanical properties of Mg-Zn-Y alloys
Lee, JY
Do, HK
Lim, HK
Kim, DH
[J]. MATERIALS LETTERS, 2005, 59 (29-30) : 3801 - 3805
[8] MICROSTRUCTURES AND MECHANICAL-PROPERTIES OF RAPIDLY SOLIDIFIED CU-CR ALLOYS
MORRIS, MA
MORRIS, DG
[J]. ACTA METALLURGICA, 1987, 35 (10): : 2511 - 2522
[9] Thermodynamic modelling of the Y-Zn and Mg-Zn-Y systems
Shao, G.
Varsani, V.
Fan, Z.
[J]. CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, 2006, 30 (03): : 286 - 295
[10] SHAO G, 1993, INT J RAPID SOLIDIF, V8, P41

← 1 2 →