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采用光学浮区定向凝固炉,对Ti-43Al-3Si合金进行引晶定向生长研究.从直径70 mm铸棒中切取直径9 mm多晶棒为籽晶,在5 mm/h的速度下引晶生长出了微观片层平行于生长方向的定向合金.采用OM对获得试样的组织进行观察,结果表明,在开始凝固的L+α+β三相共存区中,多晶棒有效引晶并控制了心部α相,并在曲面生长条件下逐渐发展成为占据主导地位的组织结构.对实验中多晶籽晶的选取、三相共存及曲面生长原理进行了深入讨论.
The directional growth of Ti-43Al-3Si alloy was investigated by using an optical floatation directional solidification furnace.The diameter of 9 mm polycrystalline rods was cut from 70 mm diameter rods and seeded at a speed of 5 mm / h The growth direction of the micro-oriented layer parallel to the growth direction of the alloy.Using OM to obtain the sample microstructure was observed, the results show that in the beginning of solidification of the L + α + β three-phase coexistence zone, Controlled α-phase of the heart, and gradually developed into the dominant structure under the condition of surface growth.The principles of polycrystalline seed selection, three-phase coexistence and surface growth were discussed in depth.