A 3D-Printed Ultra-Low Young's Modulus β-Ti Alloy for Biomedical Applications

被引：32
作者：
Pellizzari, Massimo [1 ]
Jam, Alireza [1 ]
Tschon, Matilde [2 ]
Fini, Milena [2 ]
Lora, Carlo [3 ]
Benedetti, Matteo [1 ]
机构：
[1] Univ Trento, Dept Ind Engn, I-38123 Trento, Italy
[2] IRCCS, Ist Ortoped Rizzoli, Lab Preclin & Surg Studies, I-40136 Bologna, Italy
[3] SISMA Spa, I-36013 Piovene Rocchette, VI, Italy
来源：
MATERIALS | 2020年 / 13卷 / 12期
关键词：
3D-printing; orthopaedic biomaterials; bone prosthesis; beta-Titanium alloy; Young's modulus; cytotoxicity; MECHANICAL-PROPERTIES; TITANIUM-ALLOY; HEAT-TREATMENT; TENSILE PROPERTIES; IN-VITRO; MICROSTRUCTURE; FATIGUE; BEHAVIOR; ALPHA; FABRICATION;
D O I：
10.3390/ma13122792
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The metastable beta-Ti21S alloy is evaluated as a potential candidate for biomedical parts. Near fully dense (99.75 +/- 0.02%) samples are additively manufactured (that is, 3D-printed) by laser powder-bed fusion (L-PBF). In the as-built condition, the material consists of metastable beta-phase only, with columnar grains oriented along the building direction. The material exhibits an extremely low Young's modulus (52 +/- 0.3 GPa), which was never reported for this type of alloy. The combination of good mechanical strength (sigma(y0.2)= 709 +/- 6 MPa, ultimate tensile strength (UTS) = 831 +/- 3 MPa) and high total elongation during tensile test (21% +/- 1.2%) in the as-built state, that is, without any heat treatment, is close to that of the wrought alloy and comparable to that of heat treated Ti grade 5. The good biocompatibility attested by cytotoxicity tests confirms its great suitability for biomedical applications.
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页码：1 / 16
页数：16
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