Paper Title:
Relationship between the Valence Electron Structures of Precipitated Phases and Thermostability of Mg-Al-Si Alloy
  Abstract

The valence electron structures of the matrix and the precipitated phases of Mg17Al12 and Mg2Si of Mg-Al-Si alloy were calculated, then the space structures of covalent bonds of precipitated phases were analysed. The results show that the structures of the two main bonds of Mg17Al12 are connected through the weaker bond G and its thermostability are lower. The strongest bond A of Mg2Si has three dimensional structure and does not exist the weaker segment of covalent bond structure, so its thermostability is high. Under room temperature, the strengthening mechanism of Mg17Al12 and Mg2Si lies in their atom bond force far large than that of the matrix and they effective locate the dislocation movement. When temperature is above 120 °C, the bond G breaks and Mg17Al12 disrupts, so it can not play a role of locating the grain boundary and controlling the grain boundary of high temperature. But it is not easy for the covalent bond structure of Mg2Si to disrupt under high temperature, so it can effectively obstruct the movement of the grain boundary and dislocation.

  Info
Periodical
Advanced Materials Research (Volumes 183-185)
Chapter
Materials Engineering
Edited by
Yanguo Shi and Jinlong Zuo
Pages
2068-2072
DOI
10.4028/www.scientific.net/AMR.183-185.2068
Citation
H. Qu, W. D. Liu, G. Zhou, X. L. Shen, C. Liu, "Relationship between the Valence Electron Structures of Precipitated Phases and Thermostability of Mg-Al-Si Alloy", Advanced Materials Research, Vols. 183-185, pp. 2068-2072, 2011
Online since
January 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Hong Li Wu, Xin Qing Zhao, Jian Xu, Chun Gen Zhou, Hui Bin Xu
Abstract:A first principle study was performed to discuss the high temperature oxidation mechanism of NiTi alloys with the special emphasis on the...
1471
Authors: Hua Qu, Wei Dong Liu, Yu Ying Liu
Abstract:Based on the empirical electron theory of solids and molecules (EET), the valence electron structures (VESs) of the strengthening phases...
1291
Authors: Fei Li, Xia Zhao
Abstract:Based on the average atom model, the statistical values of valence electron structure (VES) parameters Δρ′, σ of homophase interface...
147
Authors: Xiao Lin Shu, Yong Fei Jia, Zi Yu Chen
Abstract:The size and the electronic factor are used to analyze the occupation of doped Co atom in L10 FePt alloy as well as its influence on crystal...
461
Authors: Gennady Poletaev, Darya Novoselova, Mikhail D. Starostenkov, Vladimir Tsellermaer, Viktor Kovalenko
Chapter 1: Numerical Simulation of Physical and Chemical Processes
Abstract:The interaction of atom-atom collisions cascades with Ni-Al interphase boundary was studied by the method of molecular dynamics. It was shown...
8