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首页> 外文会议>Asia-Pacific Symposium on Engineering Plasticity and Its Applications >Mechanical Alloying of Ti-Ai-Si-C Powders, Their Thermal Stability, Phase Evolution, and Synthesis and Deformation of In Situ Produced Titanium Aluminide Composites
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Mechanical Alloying of Ti-Ai-Si-C Powders, Their Thermal Stability, Phase Evolution, and Synthesis and Deformation of In Situ Produced Titanium Aluminide Composites

机译：Ti-Ai-Si-C粉末的机械合金化，它们的热稳定性，相进化和原位生产的钛铝化合物复合材料的合成及变形

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Addition of silicon promotes the development of a stable phase Ti_5Si_3 through thermo-mechanical treatment in TiAl-based alloys develop, while carbon seems to be a promising element for generating both solid solution effect and dispersion strengthening by precipitation of TiC or Ti_2AlC during subsequent processing of such alloys. In this study, elemental powder mixture of 58Ti-30Al-6Si-6C (at percent) was selected to find the structural changes during mechanical alloying (MA) process in order to understand the mechanism of alloying as well as study the subsequent thermal stability and evolution of phases. The results obtained would be useful towards in situ synthesis of titanium aluminide composites that are targeted to serve applications involving high tempearture. Such route will enable precipitation of harder Ti_5Si_3 and TiC particles within a matrix of TiAl through hot isostatic pressing (HIP). Firstly, MA of the chosen powder mix was performed up to 40 hours. The structural evolution of MA powders and/or annealed powders was characterized by X-ray diffraction (XRD). The stability of milled powders was investigated by differential scanning calorimetry (DSC) to study the phase transformations. Then, 10 percent of MA powder or the so called 'precursor' was incorporated into Ti-45Al-2Cr-4Nb-1.5Mn (at percent) baseline matrix or baseline elemental powder, and was packed into stainless steel tubes after thorough blending. The sealed tubes were subjected to HIPing under a pressure of 150 MPa at 1100 deg C for 4 hours, followed by furnace cooling to room temperature. After HIPing, the resulted composites were annealed at 1150 deg C for 4 hours. The composites were evaluated for their mechanical properties and deformability at room and elevated temperatures. The results indicate that the synthesized composites have indicated extensive workability at a temperature of 800 deg C as well as good mechanical proporties up to this temperature.
机译：通过在Tial基合金中产生的热机械处理促进硅的添加促进稳定相Ti_5Si_3的发育，而碳似乎是在随后的加工过程中产生固体溶液效应和通过TIC或Ti_2ALC的沉淀产生固体溶液效应和分散的有希望的元件这种合金。在该研究中，选择58Ti-30Al-6Si-6C（以百分比）的元素粉末混合物，以在机械合金化（MA）过程中找到结构变化，以了解合金化的机制以及研究随后的热稳定性和阶段的演变。所获得的结果对于原位合成硅化铝复合材料是有用的，该铝化物复合材料可用于提供涉及高温的应用。这种途径将通过热等静压（臀部）在Tial的基质中能够降低较硬的Ti_5Si_3和TiC颗粒。首先，所选择的粉末混合物的MA可达40小时。通过X射线衍射（XRD）表征MA粉末和/或退火粉末的结构演变。通过差示扫描量热法（DSC）研究了研磨粉末的稳定性，以研究相变。然后，将10％的MA粉末或所谓的“前体”纳入Ti-45Al-2Cr-4nb-1.5mn（以百分比）基线基质或基线元素粉末，并在彻底混合后填充到不锈钢管中。将密封管在150MPa的压力下在1100℃下进行臀部4小时，然后用炉冷却至室温。臀部后，将得到的复合材料在1150℃下退火4小时。评估复合材料在室内的机械性能和可变形性和升高的温度。结果表明，合成复合材料在800℃的温度下表明了广泛的可加工性，以及良好的机械比例直至该温度。

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