Microstructure and Phase Evolution of Functionally Graded Multi-Materials of Ni-Ti Alloy Fabricated by Laser Powder Bed Fusion Process
Microstructure and Phase Evolution of Functionally Graded Multi-Materials of Ni-Ti Alloy Fabricated by Laser Powder Bed Fusion Process
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DOI：
10.1016/j.jmrt.2023.02.151
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
P. Daram;T. Hiroto;M. Watanabe
中科院分区：
文献类型：
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作者：
P. Daram;T. Hiroto;M. Watanabe
采用逐层激光粉末床熔融（L-PBF）工艺制备了镍钛合金功能梯度复合材料（FGM）。通过不同的成分梯度，构建了成分从纯Ni递增渐变到纯Ti的FGM Ni-Ti合金。利用SEM、EDS、XRD和EBSD等手段沿沿着成型方向对材料的微观结构、化学成分和相演变进行了表征。通过改变Ni和Ti的比例，显微组织和相在整个构建方向上逐渐改变。通过成分梯度，合金中出现了γ-Ni → NiTiB 2+金属间化合物相→ α-Ti的相变。在梯度区中发现裂纹，并且根据存在的各种相来解释结果。实现这种完全沉积的FGM Ni-Ti合金和成分的显著变化的潜力是通过使用L-PBF增材制造来制造创新的FGM Ni-Ti合金以及3D组件的新策略来实现的。
The layer-by-layer laser powder bed fusion (L-PBF) process was applied to fabricate functionally graded multi-materials (FGMs) of nickel-titanium alloy. The FGMs Ni–Ti alloy was built with composition transitioning from pure Ni incrementally graded to pure Ti by different composition gradients. The microstructure, chemical composition, and phase evolution were characterized using SEM, EDS, XRD, and EBSD along the build direction. By varying the proportions of Ni and Ti, the microstructure and phases were changed gradually across the build direction. Several phase transformations, γ-Ni → NiTi B2 + intermetallic phases → α-Ti, appeared through the compositional gradient. Cracks were found in the gradient zone, and the results were explained in terms of the various phases present. The potential to accomplish such a completely deposited FGMs Ni–Ti alloy and considerable changes in composition are made possible by a new strategy to make innovative FGMs Ni–Ti alloys together with 3D components using L-PBF additive manufacturing.