辊轮转速对Ni-Zr-Ti基非晶纤维形貌及拉伸强度的影响

发布时间：2018-07-05 13:48

本文选题：Ni-Zr-Ti合金 + 玻璃态纤维　；参考：《稀有金属》2017年06期

【摘要】：利用高真空单辊熔体抽拉技术制备出了形貌均匀、性能优异的Ni-Zr-Ti基非晶纤维。讨论了制备过程中辊轮转速变化对所制备合金纤维的表面形貌、显微结构及拉伸强度的影响。结果表明:Ni-Zr-Ti基合金纤维的宏观形貌及微观结构对辊轮转速均存在较强的工艺依赖性。随着辊轮转速增加,纤维的厚度变化较小而宽度明显降低,纤维截面圆整度及表面形貌均匀性得到相应改善。当辊轮转速达到20 m·s~(-1)时,纤维中出现Ni_2Si相析出,析出的第二相有效抑制剪切带扩展,导致纤维在拉伸断裂前出现轻微屈服应变并在断口处留下近似韧窝状的断裂花样。当辊轮转速高于30 m·s~(-1),所制备的各组纤维均处于完全非晶态。当转速达到80 m·s~(-1)时,配合5.86 mm·min~(-1)的进给速度可使纤维的截面圆整度及平均拉伸强度(1490 MPa)达到最优值。
[Abstract]:Ni-Zr-Ti based amorphous fibers with uniform morphology and excellent properties were prepared by high vacuum single roll melt pulling technique. The effects of the rotational speed of the roller wheel on the surface morphology, microstructure and tensile strength of the alloy fibers were discussed. The results show that the macroscopic morphology and microstructure of the alloy fiber have strong technological dependence on the rotational speed of the roller wheel. With the increase of the rotational speed of the roller, the thickness of the fiber changes little and the width of the fiber decreases obviously, and the roundness of the fiber section and the uniformity of the surface morphology are improved accordingly. When the rotation speed of roller is up to 20 Ms ~ (-1), Ni2Si phase is precipitated in the fiber, the second phase effectively inhibits the expansion of shear band, which leads to the slight yield strain of the fiber before tensile fracture and the similar dimple fracture pattern at the fracture surface. When the rotation speed of the roller is higher than 30 m s ~ (-1), all the fibers prepared are in a completely amorphous state. When the rotational speed reaches 80mm / s ~ (-1), the cross-section roundness and the average tensile strength (1490 MPA) of the fiber can reach the optimum value when the feed speed is 5.86 mm / min ~ (-1).
【作者单位】：北方民族大学材料科学与工程学院;
【基金】：国家自然科学基金项目(51561001) 宁夏高等学校科研项目(NGY20140132)资助
【分类号】：TG139.8

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