Industry/University Cooperative Research Activity: Funda- mental Experimental Studies of the Micro-transformation in Hafnia Containing Materials (Materials Research)

这是陶瓷材料强化技术合作项目的第二年延续。为了了解陶瓷在很高的化学驱动力下的马氏体相变，将对含Hafnia的材料进行基础研究。将研究两种截然不同的基质材料--一种含有分散的Hafnia颗粒的bcc难熔金属，以及一种含有类似颗粒的全陶瓷材料。这是一种新的陶瓷材料体系，将允许更广泛的物理参数变化，这些参数被认为是相变增韧的重要因素。具体地说，它的参数比其他被研究的唯一一种氧化锆合金的参数要高。通过对这第二个陶瓷系统(HfO2)的研究，可以深入了解Hafnia陶瓷和氧化锆陶瓷的相变增韧。

This is the second year continuation of a cooperative project in techniques to strengthen ceramic materials. Fundamental studies of hafnia-containing materials will be performed to understand the ceramic martensitic transformations, under very high chemical driving forces. Two contrasting matrix materials--a refractory bcc metal containing a dispersion of hafnia particles, and an all-ceramic material containing similar particales--will be studied. This is a new ceramic material systems and will allow a wider variation in physical parameters believed to be important in transformation toughening. Specifically, there are higher parameters than for zirconia alloys, the only other system researched. By studying this second ceramic system (HfO2), insight into transformation toughening for both hafnia and zirconia ceramics will be gained.