A novel low-modulus titanium alloy for biomedical applications: A comparison between selective laser melting and metal injection moulding

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:812

Article

Suwanpreecha, Chanun¹  Alabort, Enrique²  Tang, Yuanbo T.³  Panwisawas, Chinnapat^3,4  Reed, Roger C.^3,5  Manonukul, Anchalee¹ 

[1] Natl Sci & Technol Dev Agcy, Natl Met & Mat Technol Ctr, 114 Thailand Sci Pk, Klongluang 12120, Pathumthani, Thailand

[2] Alloyed OxMet Technol, Unit 15,Oxford Ind Pk, Oxford OX5 1QU, England

[3] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

[4] Univ Leicester, Sch Engn, NISCO UK Res Ctr, Leicester LE1 7RH, Leics, England

[5] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

关键词: Metal injection moulding;    Selective laser melting;    Biomedical titanium alloy;    Titanium carbide;    Low elastic modulus;   

DOI  :  10.1016/j.msea.2021.141081

来源: Elsevier

【 摘 要 】

The mechanical properties of new low-modulus beta titanium alloyed designed for biomedical applications are measured and compared when processed via the selective laser melting (SLM) and the metal injection moulding (MIM) processes. Mechanical tensile testing reveals important differences between them: (i) Under optimal laser settings, SLM produces strong, low-modulus and ductile properties. This is associated with the laser creating fully dense material with appropriate microstructure after solidification. (ii) MIM can produce materials with similar strength/stiffness ratios, but with reduced ductility. The differences between the processes are linked to changes in chemistry in the microstructure: carbon pickup from MIM binder and slow cooling rate is responsible for the appearance of Ti2C resulting in low ductility and very high strength together with a transition from intergranular to transgranular fracture.

【 授权许可】

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