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首页> 外文期刊>The Journal of Prosthetic Dentistry >Tensile properties and hardness of cast Fe-Pt magnetic alloys.
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Tensile properties and hardness of cast Fe-Pt magnetic alloys.

机译：铸造Fe-Pt磁性合金的拉伸性能和硬度。

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STATEMENT OF PROBLEM: There is little information about the mechanical properties of castable magnetic attachments made of iron-platinum (Fe-Pt) alloys after heat treatment. MATERIAL AND METHODS: Dumbbell-shaped tensile specimens were cast with 5 alloys: 2 types of Fe-Pt alloys for magnets and keepers, pure Ti, Ti-6Al-7Nb, and Co-Cr alloy. The tensile specimens of the Fe-Pt magnets and keepers underwent different heat treatments to obtain the appropriate properties for a magnet and a keeper. Vickers hardness was measured prior to testing. Tensile testing was conducted in a universal testing machine at a crosshead speed of 2 mm/min until failure. Ultimate tensile strength, yield strength, elongation, and modulus of elasticity were recorded. The data were analyzed using 1-way analysis of variance and the Tukey test (alpha=.05), fractured surfaces were examined using a scanning electron microscope (SEM). RESULTS: The highest tensile and yield strengths were found for Ti-6Al-7Nb, followed by Co-Cr, CP Ti, and the Fe-Pt keeper. There was no significant difference in ultimate tensile strength between the CP Ti and the Fe-Pt keeper. The lowest elongation was found for the Fe-Pt magnet (2.8%), whereas the Fe-Pt keeper had the highest elongation (14.0%). The Fe-Pt magnet and keeper had similar modulus of elasticity values. The hardness of the cast Fe-Pt magnets was the highest among the metals tested. SEM micrographs of the Fe-Pt keepers showed a microstructure with ductile dimple fractures, whereas the Fe-Pt magnets were characterized by brittle fractures at the grain boundaries. CONCLUSIONS: The mechanical properties of the cast Fe-Pt keepers were similar to those of the cast pure Ti. The Fe-Pt magnets were extremely hard and brittle.
机译：问题陈述：有关由铁-铂（Fe-Pt）合金制成的可铸造磁性附件在热处理后的机械性能的信息很少。材料和方法：用5种合金铸造哑铃形拉伸试样：2种类型的用于磁体和保持器的Fe-Pt合金，纯Ti，Ti-6Al-7Nb和Co-Cr合金。 Fe-Pt磁体和保持架的拉伸试样经过不同的热处理，以获得磁体和保持架的适当性能。在测试之前测量维氏硬度。在万能试验机中以2mm / min的十字头速度进行拉伸试验直至失效。记录极限抗拉强度，屈服强度，伸长率和弹性模量。使用方差单向分析和Tukey检验（alpha = .05）分析数据，使用扫描电子显微镜（SEM）检查断裂的表面。结果：Ti-6Al-7Nb的拉伸强度和屈服强度最高，其次是Co-Cr，CP Ti和Fe-Pt保持器。 CP Ti和Fe-Pt保持器之间的极限抗拉强度没有显着差异。 Fe-Pt磁体的伸长率最低（2.8％），而Fe-Pt保持器的伸长率最高（14.0％）。 Fe-Pt磁体和保持器具有相似的弹性模量值。铸造的Fe-Pt磁体的硬度在测试的金属中最高。 Fe-Pt保持器的SEM显微照片显示了具有延性凹痕断裂的微观结构，而Fe-Pt磁体的特征是在晶界处存在脆性断裂。结论：铸造的Fe-Pt保持器的机械性能与铸造的纯Ti相似。 Fe-Pt磁铁非常坚硬且易碎。

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