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The Study on the Modification of Hypereutectic Aluminum-Silicon Alloy Using Thermal Analysis Technology

Author: ZengYong
Tutor: WuShuSen
School: Huazhong University of Science and Technology
Course: Materials Processing Engineering
Keywords: Thermal analysis Hypereutectic Al-Si alloy Serial communication Cooling curve Metamorphism Eigenvalue
CLC: TG146.21
Type: Master's thesis
Year: 2009
Downloads: 103
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Abstract


Over-eutectic Al-Si alloys are widely used in the manufacture of automotive engine pistons and other parts, but the coarse the polygonal massive early existence in its organization crystalline Si and a large number of flakiness eutectic Si seriously affect the mechanical properties of the alloy. Industrial often through modification to improve the alloy properties, in a variety of methods to detect the modification effect, thermal analysis method has a great theoretical and practical significance. Original hypoeutectic Al-Si alloy thermal analysis system based on our laboratory to improve and refine the original system's hardware and software so that it can be completed within 5min eutectic Al-Si alloy effect judge. Signal conversion module using the data acquisition module of the I-7018 and I-7520 to establish a new thermal analysis system, to complete the precise acquisition of the raw temperature data by serial communication, and comparison of the three commonly used serial communication VC environment, optional the thread under CSerialPort class to complete control of the serial communication, thermal analysis equipment and computer interface issues, in addition to using the RS232 protocol via RS232 serial port to communicate directly to USB conversion cable, so that the system via the USB interface and computer communication greatly improve the data transfer speed, flexibility, and convenience. Average filtering method in the processing of the raw temperature data, the choice of the three-point central difference method for the calculation of the differential curve, and then choose to adjacent the average temporal filtering method for the differential curve smoothing filter. Eutectic Al-Si alloy solidification cooling characteristics based on the identification of the primary crystal phase and eutectic phase thermal analysis eigenvalue corresponding algorithm. Eutectic Si P metamorphism of the early use of thermal analysis system newly developed by our group of Al-20Si-1.5Cu-1Ni-0.5Mn high silicon aluminum thermal analysis to study the modification effect and alloy early crystal segment thermal analysis eigenvalue the relationship between the results show that a good corresponding relationship between the ΔTg (primary crystal growth temperature difference), and the average grain size of primary Si, when ΔTG of between 35 ° C to 45 ℃, the primary crystal silicon has a better modification effect lt when ΔTG; 30 ° C, no significant modification effect. Thermal analysis system Al-20Si-1.5Cu-1Ni-0.5Mn-0.4Mg Re deterioration of high silicon aluminum thermal analysis results show that, in did not occur, the deterioration of the premise, ΔTEG (eutectic growth temperature difference value) to 6.5 ℃ to 7.6 ℃, the eutectic Si has a good modification effect, no significant modification effect when ΔTEG lt; 4.3 ℃ ΔTEG and eutectic modification effect better.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Aluminum
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