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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.5; Jul 7-11, 2003; Leganes, Madrid, Spain >Effect of Boron on Lamellar Grain Refinement and Lath Formation in Wrought Processed Gamma TiAl Alloys
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Effect of Boron on Lamellar Grain Refinement and Lath Formation in Wrought Processed Gamma TiAl Alloys

机译：硼对锻造γ-TiAl合金层状晶粒细化和板条形成的影响

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摘要

Effects of boron additions (0-0.5 at%) are discussed in wrought processed fully lamellar microstructures of TiAl-base alloys. Boron additions greater than 0.03at% produce borides present (often in the ribbon forms) in interdendritic regions. Hot working (forging or extrusion) breaks up and redistributes these borides into arrays of flake-like borides that effectively retard the high- -temperature alpha-grain growth through the GB pinning process. For the given forging reduction, the resulting lamellar grain sizes for each alloy set are quantitatively related to the boron content. The borides on alpha grain boundaries help the gamma phase nucleate to raise the lamellar formation temperatures, leading to the formation of coarser and more inhomogeneous lath structures.
机译：在锻造的TiAl基合金的完全层状显微组织中讨论了硼添加量（0-0.5 at％）的影响。硼添加量大于0.03at％时，会在树突间区域产生硼化物（通常呈带状）。热加工（锻造或挤压）会破裂，然后将这些硼化物重新分配成片状硼化物阵列，从而通过GB钉扎过程有效地阻止高温α晶粒的生长。对于给定的锻造量减少，每种合金组的最终层状晶粒尺寸与硼含量定量相关。 α晶界上的硼化物有助于γ相成核，从而提高层状地层温度，从而导致形成更粗，更不均匀的板条结构。

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