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China Foundry

, Volume 15, Issue 2, pp 89–96 | Cite as

Characterizations of precipitation behavior of Al-Mg-Si alloys under different heat treatments

  • Hui Li
  • Jia-yi Wang
  • Hai-tao Jiang
  • Zheng-feng Lü
  • Zhen-feng Zhu
Research & Development
  • 56 Downloads

Abstract

The solidification-precipitation behavior of Al-Mg-Si multicomponent alloys has long been an absorbing topic. Experiments were carried out to analyze the precipitation behaviors of Al-Mg-Si alloys under different heat treatments. All specimens were homogenized at 570 °C for 8 h, and then solution treated at 540 °C for 55 min. Subsequently, the specimens were age treated for different times at temperatures of 100 °C, 150 °C and 180 °C, respectively. The experimental results show that the occurrence of dispersed free zones (DFZ) is caused by the uneven distribution of dispersed phase. During the aging process, pre-β" phases form at the initial stage and an aging temperature of 100 °C is too low to complete the transformation of pre-β" to β". At 150 °C, the precipitation sequence is concluded as ssss-pre-β"-pre-β"+β"-β"-β'-β. Moreover, changes in sizes and densities of the pre-β", β"and β' phases during the aging process has an important influence on the evolution of microhardness and electrical resistivity. The microhardness peak value of 150 °C is similar to that of 180 °C, which is -141 HV. While, at 100 °C, the microhardness increases slowly, and the attainable value is 127 HV up to 19 days. When the aging temperature is 100 °C, the electrical resistivity has the highest average value. When the aging temperature exceeds 100 °C, with the occurrence and growth of P'and P', the resistivity has a distinct decrease with prolonged aging time.

Keywords

Al-Mg-Si alloy heat treatment precipitation behavior electrical resistivity 

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Copyright information

© Foundry Journal Agency and Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Hui Li
    • 1
    • 3
  • Jia-yi Wang
    • 2
  • Hai-tao Jiang
    • 2
  • Zheng-feng Lü
    • 3
  • Zhen-feng Zhu
    • 1
  1. 1.College of EngineeringYantai Nanshan UniversityYantaiChina
  2. 2.Institute of Engineering TechnologyUniversity of Science and Technology BeijingBeijingChina
  3. 3.National Engineering Research Center for Plastic Working of Aluminum AlloysShandong Nanshan Aluminum Co., Ltd.YantaiChina

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