NDLI: Heat Treatments of Metastable β Titanium Alloy Ti-24Nb-4Zr-8Sn Processed by Laser Powder Bed Fusion

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Heat Treatments of Metastable β Titanium Alloy Ti-24Nb-4Zr-8Sn Processed by Laser Powder Bed Fusion

Content Provider	MDPI
Author	Hein, Maxwell Dias, Nelson Filipe Lopes Pramanik, Sudipta Stangier, Dominic Hoyer, Kay-Peter Tillmann, Wolfgang Schaper, Mirko
Copyright Year	2022
Description	Titanium alloys, especially β alloys, are favorable as implant materials due to their promising combination of low Young’s modulus, high strength, corrosion resistance, and biocompatibility. In particular, the low Young’s moduli reduce the risk of stress shielding and implant loosening. The processing of Ti-24Nb-4Zr-8Sn through laser powder bed fusion is presented. The specimens were heat-treated, and the microstructure was investigated using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The mechanical properties were determined by hardness and tensile tests. The microstructures reveal a mainly β microstructure with α″ formation for high cooling rates and α precipitates after moderate cooling rates or aging. The as-built and α″ phase containing conditions exhibit a hardness around 225 HV5, yield strengths (YS) from 340 to 490 MPa, ultimate tensile strengths (UTS) around 706 MPa, fracture elongations around 20%, and Young’s moduli about 50 GPa. The α precipitates containing conditions reveal a hardness around 297 HV5, YS around 812 MPa, UTS from 871 to 931 MPa, fracture elongations around 12%, and Young’s moduli about 75 GPa. Ti-24Nb-4Zr-8Sn exhibits, depending on the heat treatment, promising properties regarding the material behavior and the opportunity to tailor the mechanical performance as a low modulus, high strength implant material.
Starting Page	3774
e-ISSN	19961944
DOI	10.3390/ma15113774
Journal	Materials
Issue Number	11
Volume Number	15
Language	English
Publisher	MDPI
Publisher Date	2022-05-25
Access Restriction	Open
Subject Keyword	Materials Manufacturing Engineering Laser Powder Bed Fusion Ti-24nb-4zr-8sn Titanium Alloy Biomedical Engineering Mechanical Properties Microstructure X-ray Diffraction
Content Type	Text
Resource Type	Article

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