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Variant selection of α precipitation in a beta titanium alloy during selective laser melting and its influence on mechanical properties

机译：选择性激光熔化过程中β钛合金α沉淀的变体选择及其对机械性能的影响

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摘要

A β titanium alloy was fabricated horizontally and vertically at two different energy densities by selective laser melting. The microstructures of the as-fabricated samples were examined using a range of characterization techniques and the properties evaluated by tensile testing. It was found that the samples that were horizontally built at the lower energy density were dominated by both β and athermal ω phases while the vertically built samples consist of not only β and ω but also nano-sized α laths. Increased energy density led to a significant increase of α in horizontally built samples which tended to constitute a grid-like structure in the β matrix. All the α-bearing samples showed preferential a variant selection and pronounced α micro-texture. The α-free samples all showed high 0.2% yield strengths (922-934 MPa), high ultimate tensile strengths (935-939 MPa) and good ductility (10.2%-13.8% elongation) whereas the α-bearing samples all exhibited poor ductility (elongation ＜ 1.2%). A significant anisotropy in plasticity was observed in the samples made with the lower energy density. Transmission electron microscopy examination revealed that the α-free samples experienced global plastic deformation via both long-range dislocation slipping and twinning whereas the α-bearing samples underwent localised plastic deformation where slipping was either interrupted by the nano-sized α laths or contained within the α-grid demarcated β matrix, which may account for their poor ductility.
机译：通过选择性激光熔化在两个不同的能量密度下水平和垂直制造β钛合金。使用一系列表征技术和通过拉伸试验评估的性能来检查制造样品的微观结构。发现水平构建在较低能量密度下的样品由β和静脉ω相位主导，而垂直构建的样品不仅包括β和ω，还包括纳米大小的α板条。增加的能量密度导致水平构建的样品中α的显着增加，这倾向于构成β基质中的网格状结构。所有α轴承样品都显示出优先的变体选择和发音α微纹理。无α的样品均显示出高0.2％的屈服强度（922-934MPa），高极致拉伸强度（935-939MPa）和良好的延展性（伸长率为10.2％-13.8％），而α轴承样品均表现出较差的延展性（伸长率<1.2％）。在具有较低能量密度的样品中观察到可塑性的显着各向异性。透射电子显微镜检查显示，无α的样品通过远程位错滑动和孪晶经历了全球塑性变形，而α轴承样品经历了局部塑性变形，其中通过纳米尺寸的α板条中断或容纳在其中α-栅格划分的β矩阵，其可能占他们的延展性差。

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