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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >On the precipitation of TiB_2 in aluminum melts from the reaction with KBF_4 and K_2TiF_6
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On the precipitation of TiB_2 in aluminum melts from the reaction with KBF_4 and K_2TiF_6

机译：与KBF_4和K_2TiF_6反应导致铝熔体中TiB_2析出

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摘要

The divergent reaction between Al and the two salts K_2TiF_6 and KBF_4 are used in the manufacturing of Al-Ti-B master alloys for grain refinement. It is also possible to use the same reaction to make aluminum based metal matrix composites. The formation sequence of TiB_2 from the reaction with K_2TiF_6 and KBF_4 is discussed in the view of the formation of a salt/metal emulsion and agglomeration. The highly exothermic reaction with K_2TiF_6 will aid the formation of an emulsion and Al_3Ti form that in a subsequent step transforms into TiB_2. It will also support high element transfer efficiency. The reaction with KBF_4 causes less heat to evolve and the tendency towards formation of an emulsion and thus lower transfer efficiency resulting in a sluggish formation of AlB_2. Simultaneous additions of K_2TiF_6 and KBF_4 increase the transfer efficiency but will cause the formation of stringer defects in a layered structure.
机译：Al与两种盐K_2TiF_6和KBF_4之间的发散反应用于制造Al-Ti-B中间合金以细化晶粒。也可以使用相同的反应来制备铝基金属基复合材料。从盐/金属乳化液的形成和团聚的角度，讨论了与K_2TiF_6和KBF_4反应生成TiB_2的顺序。与K_2TiF_6的高度放热反应将有助于形成乳液和Al_3Ti形式，并在随后的步骤中转化为TiB_2。它还将支持高元素转移效率。与KBF_4的反应导致较少的热量散发出来，并且易于形成乳液，从而降低了转移效率，导致形成缓慢的AlB_2。同时添加K_2TiF_6和KBF_4可以提高转移效率，但会导致在分层结构中形成更严格的缺陷。

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