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Superplastic Extrusion of Al_2O_3-YTZ Nanocomposite and its Deformation Mechanism

机译:Al_2O_3-YTZ纳米复合材料的超塑性挤出及其变形机理

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Using Al_2O_3-YTZ(3mol% yttria stabilized tetragonal zirconia) nanocomposite, superplastic extrusion under different conditions was adopted to form blade models. The results demonstrate that desired microstructure is achieved through the addition of 20mol% YTZ which acts as a second-phase pinning agent. At temperature range of 1650℃ to 1700℃ the material shows good deformability. At this elevated temperature the maximum extrusion pressure is lower than 25MPa, and the maximum punch speed is about 0.35mmmin~(-1). In superplastic extrusion the dominating deformation mechanism is grain sliding and rotation, the accommodating mechanism is intergranular zirconia coordinated deformation. Meanwhile static and dynamic grain growth also plays an important role in deformation.
机译:以Al_2O_3-YTZ(3mol%氧化钇稳定的四方氧化锆)纳米复合材料为材料,采用不同条件下的超塑性挤出成型叶片模型。结果表明,通过添加用作第二相钉扎剂的20mol%的YTZ获得了所需的微观结构。在1650℃至1700℃的温度范围内,材料表现出良好的可变形性。在此高温下,最大挤出压力低于25MPa,最大冲压速度约为0.35mmmin〜(-1)。在超塑性挤压中,主要的变形机制是晶粒滑动和旋转,调节机制是晶间氧化锆协同变形。同时,静态和动态晶粒生长在变形中也起着重要作用。

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