Achieving high strength and ductility in laser powder bed fusion-manufactured pure titanium through the addition of carbon nanotubes

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2025-02-25 DOI:10.1007/s12598-024-03186-7

Li Ma, Chang-Shun Wang, Ye Ma, Jae-Hyuk Kim, Cheng-Lin Li, Jae-Keun Hong

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引用次数: 0

Abstract

The features of additive manufacturing (AM) have made commercially pure titanium (CP-Ti) an attractive candidate material for biomedical implants. However, achieving high strength and ductility is challenging because of the columnar structures and fine martensite formation. This study investigated the effect of carbon nanotubes (CNTs) addition on the microstructure and mechanical properties of grade 1 CP-Ti (Gr-1) during the laser powder bed fusion (L-PBF) process. A minute amount of 0.2% mass fraction (wt%) CNTs addition resulted in a high yield strength of approximately 700 MPa and exceptional ductility of 25.7%. Therein, a portion of the CNTs dissolved in the matrix as solute atoms, contributing to solution strengthening, while others were transformed into TiC_x through an in situ reaction with the Ti matrix. Furthermore, the addition of CNTs resulted in the formation of a larger fraction of equiaxed grains and increased the activity of basal and prismatic slip systems. Hence, Gr-1 with CNTs exhibited significantly increased ductility while maintaining a high strength comparable to that of Gr-1 without CNTs. The insights gained from this study provide a novel approach for designing strong and ductile Ti alloys for AM.

Graphical abstract

查看原文本刊更多论文

通过添加碳纳米管，在激光粉末床熔合制备纯钛中实现高强度和高延展性

增材制造（AM）的特点使商业纯钛（CP-Ti）成为生物医学植入物的有吸引力的候选材料。然而，由于柱状组织和细小的马氏体形成，实现高强度和延展性是具有挑战性的。研究了在激光粉末床熔合（L-PBF）过程中添加碳纳米管（CNTs）对1级CP-Ti （Gr-1）显微组织和力学性能的影响。添加0.2%质量分数（wt%）的CNTs，其屈服强度达到约700 MPa，延展性达到25.7%。其中，一部分碳纳米管作为溶质原子溶解在基体中，有助于溶液强化，而另一部分碳纳米管通过与Ti基体的原位反应转化为TiCx。此外，CNTs的加入导致了更大比例等轴晶粒的形成，并提高了基滑移体系和棱柱滑移体系的活性。因此，与未添加CNTs的Gr-1相比，添加CNTs的Gr-1在保持高强度的同时，延展性显著提高。从本研究中获得的见解为设计用于增材制造的强韧性钛合金提供了一种新的方法。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.