Scholarlink

<p>In the present study, the synergistic effects of scandium (Sc) and zirconium (Zr) additions, as well as the influence of secondary processing (rolling and aging), on the microstructure and hardness of squeeze-cast Al-7Si-0.8Mg alloy were investigated. It was observed that the addition of 0.3&#xa0;wt.% Sc and 0.2&#xa0;wt.% Zr formed intermetallic phases that enhanced the hardness of the alloy compared to the base Al-7Si-0.8Mg alloy. Conventional aging treatment resulted in a significant increase in the hardness of both alloys due to precipitation strengthening. Specifically, the hardness of the Al-7Si-0.8Mg alloy increased from 98 HV to 140 HV when aged for 10&#xa0;h, while the hardness of the Al-7Si-0.8Mg-0.3Sc-0.2Zr alloy increased from 105 HV to 145 HV in the same aging time. Furthermore, the processing route involving rolling followed by aging achieved similar hardness values with reduced aging time (6&#xa0;h) for both alloys. A quantitative analysis was conducted to examine the microstructural changes in the secondary dendritic arm spacing (SDAS), the size of the phases, intermetallics, and the precipitates in the Al-7Si-0.8Mg alloy due to alloying (Sc, Zr) and processing. By conducting both qualitative and quantitative analyses of these microstructural features, the study aims to establish a clear relationship between microstructure and hardness, providing insights for designing alloys with enhanced mechanical properties.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of Alloying Addition (Sc and Zr), Rolling and Aging Treatment on the Microstructure and Hardness of Al-7Si-0.8Mg Alloy

  • 期刊论文

  • 发表日期：

    2026年3月4日

查看全文
  • Karthik Kumar,
  • R. Lakshmi Narayan,
  • Jayant Jain

摘要

In the present study, the synergistic effects of scandium (Sc) and zirconium (Zr) additions, as well as the influence of secondary processing (rolling and aging), on the microstructure and hardness of squeeze-cast Al-7Si-0.8Mg alloy were investigated. It was observed that the addition of 0.3 wt.% Sc and 0.2 wt.% Zr formed intermetallic phases that enhanced the hardness of the alloy compared to the base Al-7Si-0.8Mg alloy. Conventional aging treatment resulted in a significant increase in the hardness of both alloys due to precipitation strengthening. Specifically, the hardness of the Al-7Si-0.8Mg alloy increased from 98 HV to 140 HV when aged for 10 h, while the hardness of the Al-7Si-0.8Mg-0.3Sc-0.2Zr alloy increased from 105 HV to 145 HV in the same aging time. Furthermore, the processing route involving rolling followed by aging achieved similar hardness values with reduced aging time (6 h) for both alloys. A quantitative analysis was conducted to examine the microstructural changes in the secondary dendritic arm spacing (SDAS), the size of the phases, intermetallics, and the precipitates in the Al-7Si-0.8Mg alloy due to alloying (Sc, Zr) and processing. By conducting both qualitative and quantitative analyses of these microstructural features, the study aims to establish a clear relationship between microstructure and hardness, providing insights for designing alloys with enhanced mechanical properties.