MICROSTRUCTURES AND MECHANICAL PROPERTIES OF RAPIDLY SOLIDIFIED Al-Fe-Cr-Zr-V-Si ALLOY AND THEIR THERMAL STABILITY

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｍｅｃｈａｎｉｃａｌｐｒｏｐｅｒｔｉｅｓｏｆｔｈｅｃｏｎｖｅｎｔｉｏｎａｌａｅｒｏｎａｕｔｉｃａｌｈｉｇｈｓｔｒｅｎｇｔｈａｌｕｍｉｎｉｕｍａｌｌｏｙｓｄｅｇｅｎｅｒａｔｅｒａｐｉｄｌｙｗｈｅｎｔｈｅｔｅｍｐｅｒ...

The rapidly solidified powder of Al Fe Cr Zr V Si alloy was prepared using multi stage atomization rapid solidification device and then consolidated by hot extrusion after cold isostatic pressing and vacuum degassing. The microstructures, room and elevated temperature mechanical properties of the consolidated material and their thermal stability were studied by optical microscopy, transmission electron microscopy, hardness test and tensile test. The results show that this alloy has excellent mechanical properties at room and high temperatures and good thermal stability, and it exhibits good heat resistance at least below 400 ℃. The main second phases that strengthen this alloy are Al 12 (Fe,Cr,V) 3 Si and Al 3Zr, of which the Al 12 (Fe,Cr,V) 3 Si silicide is of bcc structure ( a =12.6 ) and has excellent thermal stability and coarsening resistance.