增材制备Ti-6Al-4V合金强磁场退火后力学性能的改善

IF 0.6 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY 稀有金属材料与工程 Pub Date : 2018-12-01 DOI:10.1016/S1875-5372(19)30017-7
Zhao Ruifeng , Li Jinshan , Zhang Ying , Li Peixuan , Wang Jiaxiang , Zou Cheng-xiong , Tang Bin , Kou Hongchao , Gan Bin , Zhang Liang , Wang Jun , William Yi Wang
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引用次数: 4

摘要

提出了一种新的磁场驱动方法,用于提高Ti-6Al-4V选择性激光熔化(SLM)的力学性能。采用x射线衍射、光学显微镜、扫描电镜和原子力显微镜等手段,对制备的样品和SLM样品在7 T强磁场下分别在β横截面下400℃、800℃和β横截面上1200℃退火30 min后的微观结构进行了全面表征。Al和V原子引起的晶格畸变由成键电荷密度表征,为固溶体强化机制和马氏体转变机制提供了原子和电子基础。在7t高磁场下,400°C和1200°C退火试样的极限抗拉强度和伸长率均因退火时间短而提高。基于热磁感应力场的耦合效应,期望通过改变相变热力学来优化Ti-6Al-4V合金的微观组织。这一假设的验证将为开发一种新的磁场驱动方法铺平道路,该方法可以有效地提高增材制造材料的机械性能。
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Improved Mechanical Properties of Additive Manufactured Ti-6Al-4V Alloy via Annealing in High Magnetic Field

A novel magnetic-field-driving approach was proposed and used to efficiently enhance the mechanical properties of selective laser melting (SLM) Ti-6Al-4V. The microstructures of the as-built and the SLM specimens annealed at 400, 800 °C below the β transus, and 1200 °C above the β transus for 30 min in the high magnetic field of 7 T were comprehensively characterized in terms of X-ray diffraction, optical microscope, scanning electron microscope, and atomic force microscope. Lattice distortions induced by Al and V atoms were characterized by bonding charge density, providing an insight into the atomic and electronic basis for the solid solution strengthening mechanism and the martensitic transformation mechanism. Referring to the as-built specimens, the ultimate tensile strength and the elongation of annealed specimens at 400 and 1200 °C in 7 T high magnetic field increase due to the short annealing time. Based on the coupling effect of force field induced by the heat and magnetic, it is expected that the microstructures of SLM Ti-6Al-4V would be conventionally optimized through changing the phase transformation thermodynamics. The validation of this hypothesis will pave a path to develop a novel magnetic-field-driving approach efficiently enhancing the mechanical properties of additive manufactured materials.

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来源期刊
稀有金属材料与工程
稀有金属材料与工程 工程技术-材料科学:综合
CiteScore
1.30
自引率
57.10%
发文量
17973
审稿时长
4.2 months
期刊介绍:
期刊最新文献
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