Paper Title:
Quench Sensitivity and its Effect on the Microstructure and Mechanical Properties of an Al-Zn-Mg-Cu Aluminum Alloy
  Abstract

The high mechanical properties in 7xxx aluminum alloy are obtained by controlling the precipitation hardening microstructure. In this work, the relationship between the microstructures and mechanical properties of 7A04 (Al-Zn-Mg-Cu) aluminum alloy during isothermal aging at 140 oC after different quenching rates has been studied in order to find its useful hardening conditions. The as-extruded samples were solution heat treated at 480 oC and cooled in air, 70 oC water, 40 oC water and 0 oC ice water. Tensile test were performed and the ultimate tensile strength and percentage of elongation were obtained. The difference in the amount of precipitates is known by DSC and the morphology of the precipitates is characterized by TEM. The results indicate that the artificial age hardening response is strongly dependent on the quenching rate. Lower quenching rate results in lower tensile strength but higher percentage of elongation in the peak age condition, and this corresponds to the difference in the size and number density of the precipitates. It is concluded that the highest ultimate tensile strength is obtained in the fastest quenching rate in 0 oC ice water (up to 870Ks-1) while stable and high percentage of elongation is achieved in the intermediate quenching rate (about 226 Ks-1).

  Info
Periodical
Advanced Materials Research (Volumes 89-91)
Edited by
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
Pages
347-352
DOI
10.4028/www.scientific.net/AMR.89-91.347
Citation
Z. Q. Liang, D. T. Zhang, C. Qiu, W. Zhang, Y. Y. Li, "Quench Sensitivity and its Effect on the Microstructure and Mechanical Properties of an Al-Zn-Mg-Cu Aluminum Alloy", Advanced Materials Research, Vols. 89-91, pp. 347-352, 2010
Online since
January 2010
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: Gui Qing Wang, Zhong Kui Zhao, Yan Liu
Abstract:The present work was performed on Al11Si3Cu0.35Mg samples cast in a permanent mold preheated to 200 °C. The tensile properties for varies...
357
Authors: Li Ying Cui, Xiao Na Li, Min Qi
Abstract:A 10-T magnetic field was introduced to investigate precipitation behavior of Al-4wt.%Cu alloys during short time aging at 130°C. DSC,...
171
Authors: Shahram Ahmadi, Ali Shokuhfar, Arash Rezaei
Abstract:To respond the need of industries to the new materials with higher specific modulus and lower density than those of the older Al alloys,...
18
Authors: Carlos Augusto Nascimento Oliveira, Euclides Apolinário Cabral De Pina, Cezar Henrique Gonzalez, Carlos José de Araújo, U.S.L. Filho, Oscar Olimpio de Araujo Filho
Abstract:The use of smart material such as Ti-Ni in actuators application requires an intense mechanical and metallurgical investigation to understand...
49
Authors: Hong Wei Liu, Yon Gan Zhang, Jian Bo Zhang, Bao Hong Zhu, Feng Wang, Zhi Hui Li, Xi Wu Li, Bai Qing Xiong
Chapter 1: Materials Properties
Abstract:Microstructural characterization of Al-Cu-Mg-Ag alloy ageing at low and elevated temperature were investigated by differential scanning...
1225