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Quantitative evaluation of hidden hierarchical pores in laser additive manufactured bulk metallic glasses via computed tomography
Materials Letters ( IF 3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.matlet.2020.127376
Linlin Zhai , Yunzhuo Lu , Lu Wang , Xing Lu

Abstract Laser additive manufacturing (LAM) technology presents a great chance to break through the size limitation and realize the wide applications of bulk metallic glasses (BMGs). However, one of the inherent problems associated with this technical route is the unavoidable hidden pore defects, which is detrimental to the mechanical properties of the BMGs. In the present study, a comprehensive investigation of hidden pore defects in a typical model BMG Zr51Ti5Cu25Ni10Al9 fabricated by LAM is performed by using the computed tomography (CT) technology. The overall porosity of the LAMed BMG samples is found to be increased with increasing laser power. However, the variation trends of the proportions for different-size pores are not the same. Specifically, the proportions of larger pores are increased with the consumption of small ones as the laser power increasing. This opposite evolution trends of pores with the increasing laser power is analyzed from the Marangoni effect in the molten pool flow.

中文翻译:

通过计算机断层扫描对激光增材制造的块状金属玻璃中隐藏的分层孔隙进行定量评估

摘要 激光增材制造(LAM)技术为突破尺寸限制,实现大块金属玻璃(BMGs)的广泛应用提供了绝佳机会。然而,与该技术路线相关的固有问题之一是不可避免的隐藏孔隙缺陷,这对 BMG 的机械性能不利。在本研究中,使用计算机断层扫描 (CT) 技术对 LAM 制造的典型模型 BMG Zr51Ti5Cu25Ni10Al9 中的隐藏孔隙缺陷进行了全面调查。发现 LAMed BMG 样品的整体孔隙率随着激光功率的增加而增加。然而,不同尺寸孔隙的比例变化趋势并不相同。具体来说,随着激光功率的增加,大孔的比例随着小孔的消耗而增加。从熔池流中的马兰戈尼效应分析了随着激光功率的增加,孔隙的这种相反的演变趋势。
更新日期:2020-04-01
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