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首页> 外文会议>Powder metallurgy world congress amp; exhibition >SHS Processing of Gamma Titanium Aluminide from Mechano-Activated Elemental Powders
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SHS Processing of Gamma Titanium Aluminide from Mechano-Activated Elemental Powders

机译：机械活化元素粉末的SHS处理伽马铝化钛

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In spite of its outstanding properties, Y-TiAl use as lightweight structural material for high temperatures applications is still limited by difficulties of its processing by classical metallurgy. Although powder metallurgy seems more convenient, its application by classical route imposes special consolidation methods as Y-TiAl powder has poor compressibility and sinterability. At SHS processing from elemental powders a-TiAI_3 and a_2-Ti_3AI form first, having lower Gibbs Free Energy of Formation, ΔG°_f, than TiAI. The present research proved that, in an equiatomic Ti-AI powder mixture, they can further react with Ti/AI in excess forming TiAI - reactions also having negative ΔG°_f. An intimate component mixture and an activation energy are necessary for this purpose, which can be assured by a controlled mechanical alloying prior SHS. Appropriate parameters of MA and SHS been established, able to assure y-TiAl obtaining of quite full density, high homogeneity and fine microstructure.
机译：尽管Y-TiAl具有出色的性能，但仍被传统冶金加工的困难所限制，仍被用作高温应用的轻质结构材料。尽管粉末冶金似乎更方便，但由于Y-TiAl粉末的可压缩性和可烧结性较差，因此通过经典途径进行应用需要特殊的固结方法。在SHS加工过程中，首先从元素粉末中形成a-TiAI_3和a_2-Ti_3AI，其形成的吉布斯自由能ΔG°_f比TiAI低。本研究证明，在等原子的Ti-Al粉末混合物中，它们可以进一步与Ti / Al反应，形成过量的TiAl-反应也具有负ΔG°_f。为此，必须有紧密的组分混合物和活化能，这可以通过在先的SHS进行受控的机械合金化来确保。建立了MA和SHS的适当参数，能够确保y-TiAl获得相当高的密度，高均质性和精细的微观结构。

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