Long & Medium Term Research: X-ray Analysis of Thin Film Materials Including Wear Resistant Coatings and SuperlatticeStructures

长期和中期研究：薄膜材料的X射线分析，包括耐磨涂层和超晶格结构。该奖项的推荐是根据外国英才中心的长期和中期研究计划提出的。该计划旨在使美国科学家和工程师能够在国外被证明是优秀的研究机构进行长期研究。奖项提供了开展联合研究的机会，并利用外国独特或配套的设施、专门知识和实验条件。该奖项由Jerome Cohen博士发起，旨在支持Carla J.Shute博士对瑞典为期15个月的访问，与位于Link&gt；ping的理工学院的Torsten Ericsson教授合作，研究包括耐磨涂层和超晶格结构在内的薄膜材料的X射线分析。薄膜材料的性能引起了人们的极大兴趣，因为它们比相同材料的大块样品具有更好的力学性能。研究人员将研究两种类型的薄膜结构：TiN耐磨涂层和Mo/V超晶格结构。他们将通过sin.theta多晶x射线衍射技术检查这两种材料中的残余应力。对于TiN薄膜，研究人员将研究低能离子轰击下生长过程中压应力的产生机制。对于Mo/V超晶格，他们将检验超模效应的四方应变变形理论。超模效应是在很小的波长范围内观察到的成分调制的薄膜调制结构的弹性模量增加了两到三倍。他们还将测量四方应变，界面附近的应变梯度，以及界面的强度和相干性，作为调制波长的函数，以确定相干性应变是否可以解释这种增强的力学行为。奖励建议提供资金，酌情支付国际旅行、当地出国旅行、津贴、受抚养人津贴(如果适用)，以及为美国本土机构提供250美元的固定行政津贴。

Long & Medium-Term Research: X-ray Analysis of Thin Film Materials Including Wear Resistant Coatings and Superlattice Structure. This award recommendation is made under the Program for Long & Medium-Term Research at Foreign Centers of Excellence. The program seeks to enable U.S. scientists and engineers to conduct long-term research abroad at research institutions of proven excellence. Awards provide opportunities for the conduct of joint research, and the use of unique or compli- mentary facilities, expertise and experimental conditions in foreign countries. This award for a proposal sponsored by Dr. Jerome Cohen is to support a 15 month visit by Dr. Carla J. Shute to Sweden to work with Professor Torsten Ericsson of the Institute of Technology in Link>ping on "X-Ray Analysis of Thin Film Materials Including Wear Resistant Coatings and Superlattice Structure." The properties of thin film materials are of considerable interest due to their enhanced mechanical behavior over bulk specimens of the same material. The researchers will examine two types of thin film structures: TiN wear resistant coatings and Mo/V superlattice structures. They will examine the residual stresses in both of these materials by the sin.theta polycrystalline x-ray diffraction technique. For the TiN films, the researchers will study the mechanism of compressive stress generation during growth under low energy ion bombardment. For the Mo/V superlattices, they will examine the tetragonal strain distortion theories for the supermodulus effect. The supermodulus effect is a two-three fold increase in the elastic modulus of thin film modulated structures observed for a small range of wavelengths of the composition modulation. They will also make measure- ments of the tetragonal strain, gradient in strain near the interface, and strength and coherency of the interface as a function of the wavelength of the modulation to determine if coherency strains can explain this enhanced mechanical behavior. The award recommendation provides funds to cover, as appropriate, international travel, local travel abroad, stipend, dependents' allowance if applicable, and a flat administrative allowance of $250 for the U.S. home institution.