Texture and Toughness in Single Phase Ceramics

在本研究中，将研究一种创新的加工方法对陶瓷材料力学行为的影响。特别提出了在顺磁陶瓷即钛酸铁和钇钡铜高温超导材料的加工过程中，利用磁辅助晶粒取向来控制晶体织构的方法。预计控制织构可能会影响这些陶瓷微观结构内残余应力的大小，从而影响晶粒桥接和微裂纹引起的增韧的大小。PI将与NIST的研究人员合作，在材料从加工温度冷却时，利用中子衍射和中子散射原位测量残余应力和微裂纹。期望这些研究将为在加工过程中应用磁场进行陶瓷的微结构设计和力学性能控制提供一个总体框架。

In this research the influence of an innovative processing method on the mechanical behavior of ceramic materials will be studied. In particular, it is proposed to control crystallographic texture by magnetically-assisted grain alignment during the processing of paramagnetic ceramics, namely iron titanate and yttrium barium copper high temperature superconductor material. It is expected that controlled texture may influence the magnitude of residual stresses within the microstructure of these ceramics, and hence, the magnitude of grain bridging and microcracking induced toughening. The PI will collaborate with researchers at NIST to measure residual stresses with neutron diffraction and microcracking with neutron scattering in-situ as the material is cooled from processing temperature. It is expected that these studies will provide a general framework for microstructural design and mechanical property control of ceramics by the application of a magnetic field during processing.