目前,为了在铝及铝合金铸件中细化晶粒,经常使用硼钛中间合金,把其加入到熔体中。这种中间合金除铝外,还含有5％Ti和1％B,其中2.2％Ti结合成TiB化合物,而2.8％Ti进入固溶体中组成Al_3Ti。虽然,通过向熔体中添加硼钛中间合金使晶粒细化的方法早已为人所知,但这一过程的机理还未完全弄清。有两种假说解释在 At present, boron-titanium master alloys are often used to refine grains in aluminum and aluminum alloy castings and are added to the melt. In addition to aluminum, this master alloy also contains 5% Ti and 1% B, of which 2.2% Ti binds to TiB and 2.8% Ti enters the solid solution to form Al_3Ti. Although the method of refining the grain by adding a boron-titanium master alloy to the melt has long been known, the mechanism of this process has not yet been fully understood. There are two hypotheses explained in