Carbon Nanotubes Enabled Laser 3D Printing of High-Performance Titanium with Highly Concentrated Reinforcement

被引：48

作者：

Gu, Dongdong ^{[1
,2
]}

Chen, Hongyu ^{[1
,2
]}

Dai, Donghua ^{[1
,2
]}

Ma, Chenglong ^{[1
,2
]}

Zhang, Han ^{[1
,2
]}

Lin, Kaijie ^{[1
,2
]}

Xi, Lixia ^{[1
,2
]}

Zhao, Tong ^{[3
,4
]}

Hong, Chen ^{[3
,4
]}

Gasser, Andres ^{[3
,4
]}

Poprawe, Reinhart ^{[3
,4
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Yudao St 29, Nanjing 210016, Peoples R China

[2] Nanjing Univ Aeronaut & Astronaut, Jiangsu Prov Engn Lab Laser Addit Mfg High Perfor, Yudao St 29, Nanjing 210016, Peoples R China

[3] Fraunhofer Inst Laser Technol ILT, Steinbachstr 15, D-52074 Aachen, Germany

[4] Rhein Westfal TH Aachen, Chair Laser Technol LLT, Steinbachstr 15, D-52074 Aachen, Germany

来源：

ISCIENCE | 2020年 / 23卷 / 09期

基金：

中国国家自然科学基金;

关键词：

METAL-MATRIX COMPOSITES; MECHANICAL-PROPERTIES; PURE TITANIUM; HIGH-STRENGTH; MICROSTRUCTURE; ALUMINUM; BEHAVIOR; ECAP; TI; EVOLUTION;

D O I：

10.1016/j.isci.2020.101498

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Zero- to two-dimensional nanomaterials have been incorporated into metal-matrices to improve the strength of metals, but challengingly, high-volume-fraction nanomaterials are difficult to disperse uniformly in metal matrices, severely degrading the ductility of conventionally processed metals. Here, a considerably dense uniform dispersion of in situ formed nanoscale lamellar TiC reinforcement (16.1 wt %) in Ti matrix is achieved through laser-tailored 3D printing and complete reaction of Ti powder with a small amount (1.0 wt %) of carbon nanotubes (CNTs). An enhanced tensile strength of 912 MPa and an outstanding fracture elongation of 16% are simultaneously achieved for laser-printed components, showing a maximum 350% improvement in "product of strength and elongation'' compared with conventional Ti. In situ nanoscale TiC reinforcement favors the formation of ultrafine equiaxed Ti grains and metallurgically coherent interface with minimal lattice misfit between TiC lamellae and Ti matrix. Our approach hopefully provides a feasible way to broaden structural applications of CNTs in load-bearing Ti-based engineering components via laser-tailored reorganization with Ti.

引用

页数：23

共 53 条

[1] In-situ formation of novel TiC-particle-reinforced 316L stainless steel bulk-form composites by selective laser melting [J].