Paper Titles
Influences of Rolling Conditions on Texture and Mechanical Properties of AZ31 Magnesium Alloy Processed by Differential Speed Rolling
p.287
Effect of Granule Size in Semi-Solid Slurry on Rheo-Extrusion of A7075 Aluminum Alloy
p.291
Influences of Hydrogenation on Microstructure and Microhardness of Ti6Al4V Alloy
p.295
Phase Analysis for Mg-Zn-Y Magnesium Alloys by Using Extraction Technology
p.299
HRTEM Observation of Precipitates at Early Stage of Aging in Mg-Gd-Zr Alloy
p.303
HRTEM Observation of the Age Hardening Precipitates in Mg-Gd-Sc Alloy
p.307
Changes in the Mechanical Properties and Microstructure of AZ91 Cast Mg Alloy Caused by Heat Treatment
p.311
Microstructure Sensitive Design and Quantitative Prediction of Effective Conductivity in Fuel Cell Design
p.315
Effects of Various Thermal and Environmental Exposure on the Mechanical Properties of Aluminum Alloys
p.319

HRTEM Observation of Precipitates at Early Stage of Aging in Mg-Gd-Zr Alloy

Article Preview

Abstract:

High resolution transmission electron microscopy（HRTEM）observation was performed to clarify morphology of precipitates at early stage of aging in Mg-Gd-Zr alloy. In the specimen aged at 423K, monolayer was observed on {1100}Mg planes. With increasing aging time, the monolayer and β” phase grew along the <1120>Mg directions. Arrangement of bright dots corresponding to {020}β’ except for the monolayer and β” phase was observed before peak aging stage. β’ phases formed at the same aging stage. Thus, these precipitates co-existed before peak aging stage. The monolayer, β” phase and β’ phase still co-existed in the peak aged specimen. The β’ phase was dominated in the peak hardness. It is revealed that the monolayer lying on {1100}Mg act as precursor of β” phase and β’ phase.

You might also be interested in these eBooks
PRICM 6 View Preview

Info:

Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

303-306

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.303

Citation:

Cite this paper

Online since:

October 2007

Authors:

Tokimasa Kawabata, Toshiyuki Matsuno, Kenji Matsuda, Shigeharu Kamado, Yo Kojima, Susumu Ikeno

Keywords:

Aging Treatment (AT), High Resolution Transmission Electron Microscope, Magnesium Alloy, Precipitation

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2007 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] P. Vostry, B. SMOLA, I. STULIKOVA, F. VON BUCH and B.L. MORDIKE, phy. stat. sol. (a) 175 (1999), 491.

Google Scholar

[2] X. Gao, S. M. He, X. Q. Zeng, L. M. Peng, W. J. Ding, J.F. Nie, Materials Science and Engineering A, 431 (2006) 162-167.

Google Scholar

[3] T. Kawabata, K. Matsuda, S. Kamado, Y. Kojima and S. Ikeno, J. Japan Institute of Metals, 10 (2006), 828-834.

Google Scholar

[4] T. Kawabata, Y. Fukuda, K. Matsuda, Y. Kojima and S. Ikeno, Materials Transactions, (2006), . 954-959.

Google Scholar

[5] C. Antion, P. Donnadieu, F. Perrard, A. Deschamps, C. Tassin and A. Pisch, Acta Materialia 51 (2003) 5335-5348.

DOI: 10.1016/s1359-6454(03)00391-4

Google Scholar

[6] S. M. He, X. Q. Zheng, L. M. Peng, X. Gao, J. F. Nie and W. J. Ding, Journal of Alloys and Compounds, 421 (2006) 309-313.

Google Scholar

[7] T. Honma et al, Material Science and Engineering A, 395 (2005) 301-306.

Google Scholar

[8] Nie J. F. and Muddle B. C. Scripta Mater, 40 (1999) 1089-1094.

Google Scholar

[9] J. F. Nie and B. C. Muddle, Acta mater, 48 (2000) 1691-1703.

Google Scholar

[10] Lorimer G, Azari-Khosroshaki R, Ahmed M: Proc. Int. conf. on Solid-Solid Phase Transformations, (The Jpn. Inst. Metals, 1999) pp.185-192.

Google Scholar

[11] P. J. Apps, H. Karimzadeh, J. F. King, G. W. Lorimer, Scripta materialia, 48 (2003) 1023-1028.

DOI: 10.1016/s1359-6462(02)00596-1

Google Scholar

[12] T. Sato, Isao Takahashi, Hiroyasu Tezuka and Akihiko Kamio: J. Inst. of Light metals, (1992).

Google Scholar