Mechanical and shape memory properties of porous Ni50.1Ti49.9 alloys manufactured by selective laser melting

Mohsen Taheri Andani; Soheil Saedi; Ali Sadi Turabi; M R Karamooz; Christoph Haberland; Haluk Ersin Karaca; Mohammad Elahinia

doi:10.1016/j.jmbbm.2017.01.047

Mechanical and shape memory properties of porous Ni_50.1Ti_49.9 alloys manufactured by selective laser melting

J Mech Behav Biomed Mater. 2017 Apr:68:224-231. doi: 10.1016/j.jmbbm.2017.01.047. Epub 2017 Jan 31.

Authors

Mohsen Taheri Andani¹, Soheil Saedi², Ali Sadi Turabi³, M R Karamooz⁴, Christoph Haberland⁵, Haluk Ersin Karaca⁶, Mohammad Elahinia⁷

Affiliations

¹ Dynamic and Smart Systems Laboratory, Mechanical Industrial and Manufacturing Engineering Department, The University of Toledo, 2801 W Bancroft St. MS 312 Toledo, OH 43606, USA; SM. Wu Manufacturing Research Center, College of Engineering, Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA. Electronic address: mtaheri@umich.edu.
² Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506-0503, USA. Electronic address: soheil.saedi@uky.edu.
³ Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506-0503, USA. Electronic address: sadi.turabi@uky.edu.
⁴ Department of Mechanical Engineering, Graduate University of Advanced Technology, 76311-33131, Kerman, Iran. Electronic address: m.karamooz@kgut.ac.ir.
⁵ Dynamic and Smart Systems Laboratory, Mechanical Industrial and Manufacturing Engineering Department, The University of Toledo, 2801 W Bancroft St. MS 312 Toledo, OH 43606, USA. Electronic address: haberlandchristoph@gmail.com.
⁶ Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506-0503, USA. Electronic address: karacahaluk@uky.edu.
⁷ Dynamic and Smart Systems Laboratory, Mechanical Industrial and Manufacturing Engineering Department, The University of Toledo, 2801 W Bancroft St. MS 312 Toledo, OH 43606, USA. Electronic address: mohammad.elahinia@utoledo.edu.

PMID: 28189977
DOI: 10.1016/j.jmbbm.2017.01.047

Abstract

Near equiatomic NiTi shape memory alloys were fabricated in dense and designed porous forms by Selective Laser Melting (SLM) and their mechanical and shape memory properties were systematically characterized. Particularly, the effects of pore morphology on their mechanical responses were investigated. Dense and porous NiTi alloys exhibited good shape memory effect with a recoverable strain of about 5% and functional stability after eight cycles of compression. The stiffness and residual plastic strain of porous NiTi were found to depend highly on the pore shape and the level of porosity. Since porous NiTi structures have lower elastic modulus and density than dense NiTi with still good shape memory properties, they are promising materials for lightweight structures, energy absorbers, and biomedical implants.

Keywords: Additive manufacturing; Cyclic test of NiTi; NiTi; Plastic strain; Porous implant; Selective laser melting; Shape memory alloy; Stress shielding.

MeSH terms

Alloys
Biocompatible Materials / analysis*
Lasers
Materials Testing
Nickel / analysis*
Porosity
Prostheses and Implants*
Surface Properties
Titanium / analysis*

Substances

Alloys
Biocompatible Materials
Nickel
Titanium