Thermodynamic Condition and Behavior of Precipitates in Al2O3p/7055 Composites with Cryogenic Treatment

Hong Ming Wang; Tian You Xing; Guirong Li; Xue Ting Yuan; Yu Tao Zhao; Jun Jie Wang; Kai Xuan Gu; Hong Zhang

doi:10.4028/www.scientific.net/KEM.575-576.378

Paper Titles

Study on Preparation and Properties of Foam Glazed Hollow Bead Thermal Insulation Mortar
p.361

The Research and Development of High Strength Spring Steel with Long Service Life
p.365

Research on the Melting Temperature of CaO-SiO₂-B₂O₃ Ternary Slag Systems
p.370

Microstructure and Hardness of 7055 Aluminum Alloy Processed by Circular Cryogenic-Aging Treatment
p.374

Thermodynamic Condition and Behavior of Precipitates in Al₂O_3p/7055 Composites with Cryogenic Treatment
p.378

Compare the Fluxing Effect of Boron Sludge and CaF₂ on CaO-Based Steelmaking Slag
p.382

Nanocrystalline Microstructure in AZ91 Magnesium Alloy Prepared with Cryogenic Treatment
p.386

Behavior of β(Mg₁₇Al₁₂) Phases in Mg-Al Alloy Subject to Cycling Cryogenic Treatment
p.390

Manufacture and Analysis of Directional Solidification Organization of CMSX-6 Nickel-Base Superalloy
p.394

HomeKey Engineering MaterialsKey Engineering Materials Vols. 575-576Thermodynamic Condition and Behavior of...

Thermodynamic Condition and Behavior of Precipitates in Al₂O_3p/7055 Composites with Cryogenic Treatment

Abstract:

The thermodynamic condition and behavior of precipitates were discussed about the Al₂O_{3 p}/7055 composites subjected to cryogenic treatments. A kind of software named Thermo-Calc was employed to calculate and analyze the mass amount of several main precipitates based on the thermodynamic balance theory. The results demonstrate that when the temperature decreases from 300K to 77K the precipitated amount of T(AlZnMgCu) and θ (Al₂Cu) phases will increase. For S(Al₂CuMg) phase, at 175K there is a transverse point from increasing tendency to the opposite. It should be noted that η (MgZn₂) is the main precipitated phases in compistes ,which accounts for more than eleven weight percent in one mole material. But the balance mass amount lower a little from 300K to 77K. It is analyzed that the volume shrinkage and lattice contract are the main driving forces for precipiting. Due to the difference of heat expansion coefficient among various phases the anisotropic shirinkge lead to micro voids that will act as the nucleation cores,which faciliate the precipitation.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Key Engineering Materials (Volumes 575-576)

Pages:

378-381

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.575-576.378

Citation:

Cite this paper

Online since:

September 2013

Authors:

Hong Ming Wang, Tian You Xing, Guirong Li, Xue Ting Yuan, Yu Tao Zhao, Jun Jie Wang, Kai Xuan Gu, Hong Zhang

Keywords:

Composite, Cryogenic Treatment, Thermodynamic

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] N. S. Kalsi, S, Rakesh, S. S. Vishal. Cryogenic Treatment of Tool Materials: A Review. Mat. Manufacturing Processes. 25(2010)1077-1100.

Google Scholar

[2] K. J Park, K.D. Hoon, K.B. Min. Effects of Cryogenic Treatment on Residual Stress and Tensile Properties for 6061 Al Alloy. Korea J. Metals &Mat. 49(2011) 9-16.

Google Scholar

[3] X.Y. Zhang, G.R. Li, T.W. Zhang, L. Cao H.M. Wang. Microstructure of in situ particles/7055Al matrix composites with deep cryogenic treatment. Adv. Mech. Mat. 217-219(2012)114-118.

DOI: 10.4028/www.scientific.net/amm.217-219.114

Google Scholar

[4] K.E. Asl, A. Tari，A. F. Khomamizadeh. Effect of deep cryogenic treatment on microstructure, creep and wear behaviors of AZ91 alloy, Mat. Sci. Eng. A. 523(2009) 27-31.

DOI: 10.1016/j.msea.2009.06.003

Google Scholar

[5] H. M Wang, G.R. Li, Y.T. Zhao. In situ fabrication and microstructure of Al2O3 particles reinforced Al matrix composites. Mat. Sci. Eng. A. 527 (2010) 2881-2885.

DOI: 10.1016/j.msea.2010.01.022

Google Scholar