调节Cu/Ti含量抑制激光增材制备MoNbTaVTiCu难熔复合浓合金晶界开裂

IF 1.9 Q3 ENGINEERING, MANUFACTURING

Manufacturing Letters Pub Date : 2024-11-22 DOI:10.1016/j.mfglet.2024.10.008

Solomon-Oshioke Agbedor , Hong Wu , DongHui Yang , Ian Baker

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引用次数: 0

摘要

耐火复合浓缩合金（RCCAs）由于其显微组织稳定性和在宽温度范围内优异的机械性能而被提出用于极端服务应用。然而，通过激光增材制造打印基于monbtav的rcca可能具有挑战性，因为沿晶界（GBs）发生严重的凝固开裂，导致机械强度差。在这篇简短的报告中，我们描述了一种通过成分调整产生的无裂纹的MoNbTaVTixCuy RCCA，利用Cu-Ti相抑制GB裂纹。印刷和退火后的样品均表现出良好的机械强度和导热性。

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$Inhibiting grain boundary cracking in laser additively-manufactured MoNbTaVTiCu refractory complex concentrated alloys by tuning the Cu/Ti content$

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Inhibiting grain boundary cracking in laser additively-manufactured MoNbTaVTiCu refractory complex concentrated alloys by tuning the Cu/Ti content

Refractory complex concentrated alloys (RCCAs) have been proposed for extreme service applications due to their microstructural stability and excellent mechanical properties over a wide temperature range. However, printing MoNbTaV-based RCCAs by laser additive manufacturing can be challenging on account of the severe solidification cracking that occurs along grain boundaries (GBs), leading to poor mechanical strength. In this brief report, we describe a crack-free MoNbTaVTi_xCu_y RCCA produced through compositional adjustment that leverages a Cu-Ti phase to suppress GB cracking. Printed and annealed specimen exhibited both good mechanical strengths and thermal conductivities.

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