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The Design and Research of Fe-Mn-Si Shape Memory Alloy

Author: LiuJunFeng
Tutor: ChengXiaoMin
School: Wuhan University of Technology
Course: Materials Science
Keywords: A shape memory alloy Shape Memory Effect Martensitic transformation Fe-Mn-Si alloy Shape recovery
CLC: TG139.6
Type: Master's thesis
Year: 2005
Downloads: 185
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Abstract


The use of shape memory alloy stress-induced martensitic transformation temperature induced martensitic transformation shape memory effect, a new functional materials. Fe-Mn-Si alloy is a practical performance, low cost shape memory alloy materials in recent years become a focus for researchers. Despite the late start of the alloy study, but in the superiority of fasteners and other applications makes its research progress rapidly. The design and analysis of the chemical composition of the Fe-Mn-Si alloy microstructure observation and analysis, hardness testing, the different replies annealing temperature shape memory recovery rate test, the different pre-deformation shape memory recovery rate of the test as well as shape memory Training pilot study. Mn, Si content of the alloy Nepal ear transition point, austenite transforms the end of the temperature, the martensitic transformation start temperature parameters have a very strong impact, and thus affect the shape memory effect of the alloy. In addition, a solid solution of SI strengthening effect of improving the hardness of the alloy. Thus, the alloy composition is essential to choose. To generate stress-induced martensitic transformation and reverse transformation, avoid wholly dislocation slip introduced achieve excellent shape memory effect, the Mn content of the alloy is to be controlled at 20% to 30%, the content of Si should be controlled at 4% to 6%. In this paper, industrial pure iron, manganese, and a pure silicon prepared by vacuum melting alloy Fe-22.72Mn-5.01Si. Fe-22.72Mn-5.01Si alloy high-temperature quenching after a single austenite phase. From the face-centered cubic structure of austenitic alloys under an applied stress into hcp martensite. Unload external stress, its recovery annealed alloys reverse transformation takes place, from the martensitic transformation of austenite. The alloy of the martensitic transformation layer dislocation nucleation mechanism, by the movement of Shockley partial dislocations. At the same time lower the stacking fault energy, the two Shockley partial dislocation and a stacking fault produced a new configuration is not easy to slip reversible movement pathways unique, in order to achieve the shape recovery. Within a certain deformation range, the shape memory alloy of Fe-22.72Mn-5.01Si Reply rate is increased with the increase in the amount of pre-deformation; increases as the reply to the annealing temperature, and the peak obtained in the vicinity of 600 ℃. In the training process, the alloy memory Comments first gradually increased, and then stabilized. Austenitic and martensitic the training alloy microstructure can be observed clearly austenite grain boundaries; martensite distribution is relatively uniform, parallel to each other, crossover phenomenon fewer, is conducive to the alloy in the martensite inverse transformation occurs.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Other special nature of the alloy > Shape Memory Alloys
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