Research Of The System For Materials' In-Situ Real-Time Heat Treatment And Characterization

Phase diagram, a joint diagram of material composition, structure and thermal conditions, contains the systematic component space, the specific phase identification information, the complete thermodynamic conditions and the whole phase boundary.The traditional methodology of material phase diagram is studying one sample at a time,and the as-obtained great number of experimental data can be used to complete a phase diagram. With a large number of repetitive experiments and post-processing the data they could complete a phase diagram.Our method of studying the phase diagram is a way of high-throughput combinatorial materials chip, which is called in-situ real-time (ISRT) heat treatment and characterization. The basic principle is to integrate and characterize thousands of samples with various components on a substrate at the same time. The automated micro-area characterization enable the rapid, efficient and accurate description of the material properties and the completion of the phase diagram. This thesis completes the basic design of the ISRT heat treatment and characterization system on the basis of the design of combinatorial materials chips and the characterization of the micro-area samples. Apart from the preparation of combinatorial materials chips, the system can be simply divided into two parts, the laser heating treatment unit and the characterization unit. The laser heating unit needs to realize the uniform temperature rise in the micro-area sample. On the basis of the primary heat conduction theory, the laser heating resulted temperature rise in the micro-area sample was analyzed. The temperature distribution was studied by using numerical simulation to obtain the appropriate laser irradiation power and heating way. At the same time, according to the requirements of the temperature range, temperature rate and other requirements we select the appropriate temperature measurement methods and instruments. Finally, the closed-loop feedback control system of the complete laser pulse heating system including the rapid acquisition of data, feedback control was completed.In this thesis, on the basis of the high-throughput methodology and the design principle of the combinatorial material chip, we have completed the basic research on the ISRT heat treatment and characterization system.