Novel Transformations in Metals and Alloys at High Pressures and Temperatures

小行星9403832 这项研究的中心目标是研究在极端温度和压力条件下，技术上重要的金属和合金中新相的稳定性。 这项研究是在伯明翰的亚拉巴马大学的高压实验室和CHESS和NSLS同步加速器设施的国家高压束线进行的。 金属和合金样品在金刚石压砧装置中在高压/高温下进行研究，并通过X射线衍射和激光光谱方法进行探测。 基本方面是通过压缩在金属中结合的深刻变化，并且技术潜力是在环境条件下保留这些新的修改。 本研究的重点是具有不同初始键合构型的金属和合金的原型类。 在f-电子系统中，焦点是铈-钍合金系统。 在这里的动机是要了解的f-离域下的压力在稀土和锕系金属。 在d-电子系统中，重点是钌和钛-钒合金系统，以研究从理论考虑预测的相变和在环境条件下淬火新相。 合成金刚石由于与天然金刚石相比缺乏应力诱导的荧光而显示出作为金刚石单元装置中的砧座的巨大潜力。 继续开发用于高压/高温研究的人造金刚石顶锤技术。 该补助金支持的研究设施已在过去的夏季在亚拉巴马的少数民族参与联盟（AMP）计划的本科生研究项目中使用。 培训本科生和研究生在冶金转化，同步加速器为基础的研究，并在金属和合金相变的基本理解仍然是主要的使命。 该项目旨在研究具有潜在重要性的技术材料在高压和高温下的冶金相稳定性。 ***

9403832 Vohra The central goal of this research is to investigate the stability of novel phases in technologically important metals and alloys subjected to extreme conditions of temperatures and pressures. This research is carried out at the High Pressure Laboratory at the University of Alabama at Birmingham and the National High Pressure Beam Lines at the CHESS and NSLS Synchrotron Facilities. Metals and alloy samples are studied at high pressure/high temperatures in diamond anvil cell devices and probed by x-ray diffraction and laser spectroscopic methods. The fundamental aspects are the profound changes in the bonding in metals by compression, and the technological potential is in retaining these new modifications at ambient conditions. The focus of this research is the prototype classes of metals and alloys with different initial bonding configurations. In f-electron systems, the focus is on the cerium- thorium alloy system. Here the motivation is to understand the f- delocalization under pressure in rare earths and actinide metals. In d-electron systems, the focus is on molybdenum-ruthenium and titanium-vanadium alloy systems to investigate phase transformations predicted from theoretical considerations and quenching novel phases at ambient conditions. Synthetic diamonds have shown great potential as anvils in diamond cell devices due to lack of stress induced fluorescence as compared to natural diamonds. Development of synthetic diamond anvil technology for high pressure/high temperature research is continued. The research facilities supported by this grant have been utilized in the past during the summer in the research projects for undergraduates in the Alliance for Minority Participation (AMP) program in Alabama. Training of undergraduate and graduate students in metallurgical transformations, synchrotron based research, and fundamental understanding of phase changes in metals and alloys continues to be the primary mission. %%% This grant e xplores metallurgy phase stability at high pressures and temperatures of potentially important technological materials. ***