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Study on Microstructure and Mechanical Properties of Mo-12SI-8.5B Alloy Doped with Lanthanum Oxide

wallpapers News 2021-12-02
Study on Microstructure and Mechanical Properties of Mo-12SI-8.5B Alloy Doped with Lanthanum Oxide
In this paper, the method of mechanical alloying + hot pressing sintering was used to prepare different content of lanthanum oxide (0wt%, 0.3wt%, 0.9wt%, 1.5wt.% 2.5wt.%) doped Mo-12Si-8.5B alloy. The changes in the phase and microstructure of the powder during the mechanical alloying process, as well as the influence of lanthanum oxide doping on the microstructure and mechanical properties of the alloy. The strengthening and toughening mechanism in the lanthanum oxide doped alloy is discussed. The combination of gold is annealed, and the interaction between the microstructure and mechanical properties of the alloy before and after annealing and the law of influence are discussed. The research results show that mechanical alloying can not only refine the powder and increase powder defects but also because of the high energy. The solid solution of Si into Mo to form a solid solution is conducive to the sintering process. The analysis of the sintered alloy shows that there are mainly three phases in the alloy, namely: α-Mo, Mo3Si, and Mo5SiB2 phases, of which the α-Mo phase is used as the matrix, The two intermetallic compounds Mo3Si and Mo5SiB2 phases are dispersed in it. Comparing the microstructure changes of the alloy, it is found that with the increase of the doping amount of lanthanum oxide, the grains of the alloy gradually become finer, and the distribution of the intermetallic compound phase is more uniform. Both the compressive strength and the flexural strength are improved with the doping of lanthanum oxide. The doping of lanthanum oxide does not have a significant effect on the fracture toughness of the alloy (the fracture toughness is about 9MPa·m1/2). This is mainly due to Each phase in the alloy being brittle at room temperature, so the external toughening mechanism produced by the addition of lanthanum oxide has a limited improvement in the fracture toughness of the alloy.
 

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