摘要
以Al和Mg元素混合粉末为原料,用粉末冶金模压成形和无压反应烧结方法制备出Al-Mg金属间化合物多孔材料,研究反应过程中Al-Mg金属间化合物多孔材料的相转变、体积膨胀、孔结构参数和显微形貌的变化,并对其孔隙形成机理进行讨论。研究结果表明:烧结后Al-Mg金属间化合物形成了均一的Al3Mg2相并发生了显著的体积膨胀,开孔隙率随温度的升高而增大,经435℃烧结后,达到24.7%;造孔机理是压制过程中粉末颗粒间隙孔的产生和固相扩散过程中的Kirkendall效应造孔。
Porous Al-Mg intermetallic compounds were firstly fabricated by pressureless sintering of Al and Mg elemental powders. The phase transformation, swelling behavior, pore structure parameters, microstructure and pore formation mechanisms were systematically investigated. The results show that the single Al3Mg2 phase is obtained and the swelling behavior takes place during the sintering. The volume expansion and open porosity increase with increasing sintering temperature. After sintering at 435 ℃, the porous Al-Mg intermetallic has the open porosity of 24.7%. The main pore formation mechanisms are the Kirkendall effect and the evolvement of interparticle pores.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2016年第2期223-228,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(51271158
51401175)
湖南省科技厅项目(2015WK3021)
