Project NATO SfP No.: 973 649 Quenched Materials

Original Research Plan  Objectives : Tasks See Restricted Access Area for the full contract documentation  Objectives The objectives of this projects are: development of "intelligent" strain sensors from stabilized and homogenized rapidly quenched materials for strain detection together with intelligent strain meter for detection of static and dynamic strains of civil constructions; development of method for characterization of homogeneity of soft-magnetic metallic glasses for use in post-production quality control and post-preparation treatment for stabilization and homogenization of properties of metallic glasses based mainly on magnetomechanical effects in these materials. The overall aim is to prepare and test the sensor from rapidly quenched materials based on magnetoelastic effect for strain determination together with strain sensing device for application in civil engineering, transportation and potentially also for post-production characterization of rapidly quenched magnetic materials. The science and technology to be developed and applied: The basic objectives to achieve are the following: to obtain physical understanding of the relationship between magnetomechanical properties, atomic and magnetic structure and structural stabilization (relaxation) of metallic glasses in amorphous state to determine suitable chemical compositions and conditions of thermal treatment of selected metallic glasses for optimization of magnetomechanical properties and stabilization against time, temperature and corrosion to prepare metallic glasses with determined lengthwise homogenity of selected properties with respect to the casting conditions and their fluctuations during casting to develop experimental methods for use in post-production evaluation of property fluctuations (homogeneity tests) to develop the laboratory equipment for continuous heat treatment of metallic glass ribbons to perform magnetomechanical analysis of metallic glass ribbons with respect to correlation between their magnetic characteristics and applied load to analyze the influence of mechanical stresses on magnetization and magnetostriction processes and domain structure changes due to applied stresses by magnetic force microscopy to design and tailor materials for (magnetic) detection/sensing of applied stress for use in civil engineering and transportation to design and construct "intelligent strain meter" for monitoring of strains by suitable detectors such as portable yoke pickup assembly, etc application and commercialization of developed sensor materials, strain-detecting devices and know-how transfer of physical and technological knowledge about the relationship between stability and homogenity of magnetomechanical properties and casting procedure towards optimized industrial production of lengthwisely homogeneous rapidly quenched materials The project will be solved in 5 subprojects/tasks. Problems to be addressed: technological, social and economic importance Within the project several critical scientific, technological and technical problems have to be addressed, mainly in connection with: characterization and modeling of electro-magnetic circuits for applications in industrial measurement and control systems. development of a reliable method of magnetic measurements on open samples using portable yoke or similar pickup device energy efficient portable stress detectors scientific and technical training of personnel in the field of magneto-mechanics Social and economic benefits are especially expected in the field of : development of a ubiquitous and cost effective method for monitoring civil structures increased safety due to easier stability verification environmentally safe technique using passive detection and chemically stabilized non toxic sensors   Tasks 1 Assessment of METhods of strain detection MET 2 MATerials for strain sensors MAT 3 MODeling of magnetization processes in thin soft magnetic materials MOD 4 Strain measuring SETup SET 5 APPlication, testing and implementation APP     Viev of device for rapid quenching from the melt Amorphous and nanocrystalline ribbons for diverse applications

File last modified : October 24th 2000