不同层厚激光粉末床熔融制造的 Al-Mn-Mg-Sc-Zr 合金的各向异性微观结构和拉伸性能

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
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引用次数: 0

摘要

激光粉末床熔融(LPBF)制造的铝-锰-镁-钪-锌合金通常具有柱状晶粒和等轴晶粒的双模式微观结构。这种各向异性的微观结构会导致不同取向的拉伸性能各不相同。迄今为止,关于以不同层厚制造的 LPBF Al-Mn-Mg-Sc-Zr 合金的微观结构和拉伸性能各向异性的研究报道很少,这限制了对机械性能优化的探索。本研究通过扫描电子显微镜、透射电子显微镜和拉伸试验,系统研究了以30微米和60微米层厚制造的LPBF和峰值时效Al-Mn-Mg-Sc-Zr合金的微观结构各向异性和室温拉伸性能。与 30 μm 试样相比,60 μm 的较高层厚导致晶粒更粗大,析出物的尺寸保持相似。这导致 60 μm 试样的屈服强度(492-509 兆帕)低于 30 μm 试样的 502 兆帕-510 兆帕。此外,熔池中柱状晶粒的存在导致垂直方向的有效滑移长度大于水平方向。加载方向上有效滑移长度的这种差异导致垂直方向的强度较低。在延展性方面,与 30 μm 试样(0.10%)相比,60 μm 试样(0.58%)的缺陷水平略高,导致伸长率降低 3%-6%。延展性各向异性归因于熔池边界气孔和锁孔缺陷的优先分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Anisotropic microstructure and tensile property of laser powder bed fusion fabricated Al–Mn–Mg–Sc–Zr alloy built at different layer thickness

Laser powder bed fusion (LPBF) fabricated Al–Mn–Mg-Sc-Zr alloy generally possesses a bi-modal microstructure of columnar grains and equiaxed grains. Such an anisotropic microstructure would introduce varied tensile performance in different orientations. To date, few study on the microstructure and tensile property anisotropy have been reported for LPBF fabricated Al–Mn–Mg-Sc-Zr alloys built at different layer thicknesses, which limits the exploration in mechanical property optimization. In this work, the microstructure anisotropy and room-temperature tensile properties of LPBF produced and peak-aged Al–Mn–Mg-Sc-Zr alloys built at 30 and 60 μm layer thicknesses were systematically investigated by scanning electron microscope, transmission electron microscope, and tensile testing. A higher layer thickness of 60 μm resulted in coarser grains with the precipitates size remained similarly compared to the 30 μm specimens. This led to a reduced yield strength in 60 μm specimens (492–509 MPa) comparing to those in 30 μm specimens at 502 MPa–510 MPa. In addition, the existence of columnar grains within melt pools contributed to a larger effective slip length in the vertical direction than that in the horizontal orientation. Such difference in effective slip length in the loading direction contributed to a lower strength in vertical orientations. For ductility, the slightly higher defect level in 60 μm specimens (0.58%) resulted in reduced elongations of 3%–6% compared to those of 30 μm specimens (0.10%). The ductility anisotropy was attributed to the preferential distribution of gas pores and keyhole defects at melt pool boundaries.

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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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