• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Engineering and Performance >Mechanical and Metallurgical Studies on Thixoextruded Al-Si Alloys
【24h】

Mechanical and Metallurgical Studies on Thixoextruded Al-Si Alloys

机译：硫氧化术型Al-Si合金的机械和冶金研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Thixoforming is a commonly known material processing technique that involves the fabrication of materials between solidus and liquidus temperatures. One of the prerequisites for this process is that the microstructure of the feedstock material must contain solid near-globular grains in a liquid matrix and a broad solidus-to-liquidus transition range. The aim of the present work is to study the application of Al-Si powder metallurgy (P/M) alloy in the thixoextrusion process and to evaluate the properties before and after extrusion. Al-Si P/M alloys were prepared for various Si compositions (1-7%) and Mg compositions (0.2-0.8%). The best among the Al-4Si and Al-4Si-0.6 Mg were selected based on hardness and density results. Differential thermal analysis revealed the solidus and liquidus temperatures to be 557 and 642 degrees C for Al-Si alloy and 564 and 636 degrees C for Al-4Si-0.6 Mg alloy, respectively. Compaction temperature and holding time studies have been carried out and the corresponding optimized parameters are found to be 550 degrees C and 60 min. Thixoextrusion was performed on the hot compacted preforms for three temperatures namely 560, 580 and 600 degrees C, respectively. An extrusion ratio of 4:1, strain rates of 0.1, 0.2 and 0.3 s(-1)and die approach angle of 60 degrees were used for the tests. Extrudates were divided into three regions namely front, middle and end parts to analyse its mechanical and metallurgical properties. Micrographic analysis revealed the presence of globular grains in the specimen. Hardness values showed a marginal increase from 45 to 60 HV for Al-4Si alloy and 42-80 HV for Al-4Si-0.6 Mg alloy.
机译：触变成形是一种常见的材料加工技术，涉及在固相线和液相线温度之间制造材料。该工艺的先决条件之一是，原料材料的微观结构必须包含液态基质中接近球形的固体颗粒，以及广泛的固相线到液相线的转变范围。本工作的目的是研究铝硅粉末冶金（P/M）合金在触变挤压过程中的应用，并评估挤压前后的性能。制备了不同硅含量（1-7%）和不同镁含量（0.2-0.8%）的铝硅粉末冶金合金。根据硬度和密度结果，从Al-4Si和Al-4Si-0.6 Mg中选择最佳。差热分析显示，Al-Si合金的固相线和液相线温度分别为557和642摄氏度，Al-4Si-0.6镁合金的固相线和液相线温度分别为564和636摄氏度。对压实温度和保温时间进行了研究，发现相应的优化参数为550°C和60 min。分别在560、580和600°C三种温度下对热压实预制件进行触变挤压。试验采用4:1的挤压比、0.1、0.2和0.3 s（-1）的应变速率以及60度的模具接近角。将挤出物分为前、中、端三个区域，分析其力学性能和冶金性能。显微照片分析显示试样中存在球状颗粒。对于Al-4Si合金，硬度值从45 HV略微增加到60 HV，对于Al-4Si-0.6 Mg合金，硬度值从42 HV略微增加到80 HV。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号