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采用X射线衍射(XRD)、扫描电镜(SEM)、光学显微镜(OM)等实验手段研究重熔过程中Al-5Ti-B合金的微观组织演变及其对纯铝的晶粒细化作用。结果表明:在730℃时,随着重熔体保温时间的增加,原来弥散分布的Ti B2发生偏聚,并被α-Al推向晶界处。在1000℃时,随着保温时间的增加,不仅Ti B2发生偏聚,而且Ti Al3的大小和形态均发生显著变化,Ti Al3的形貌由块状转变为粗大的长条状和针片状。重熔后的Al-5Ti-B合金仍具有较好的晶粒细化作用。
X-ray diffraction (XRD), scanning electron microscope (SEM) and optical microscope (OM) were used to study the microstructure evolution and the grain refinement of Al-5Ti-B alloy during remelting. The results show that at the temperature of 730 ℃, as the remelting time increases, the segregated Ti B2 segregates and is pushed to the grain boundaries by α-Al. At 1000 ℃, not only the segregation of Ti B2 but also the size and morphology of TiAl3 significantly changed with the increase of holding time. The morphology of TiAl3 changed from bulk to coarse strip and needle . After remelting the Al-5Ti-B alloy still has better grain refinement.