Microstructure and Mechanical Properties of Ti-Mo-Zr-Cr Biomedical Alloys by Powder Metallurgy

Abstract

Elshalakany, AB.; Ali, S.; A. Amigó Mata; Eessaa, AK.; Mohan, P.; Osman, T.; Amigó, V. (2017). Microstructure and Mechanical Properties of Ti-Mo-Zr-Cr Biomedical Alloys by Powder Metallurgy. ABSTRACTTitanium and its alloys have been widely used as biometals due to their excellent biocompatibility, corrosion resistance and moderate mechanical properties. Ti-15Mo-6Zr based alloys and a series of Ti-15Mo-6Zr-xCr (x = 1, 2, 3, 4 wt. %) alloys were designed and fabricated by powder metallurgy for the first time to develop novel biomedical materials. The microstructure, internal porosity and mechanical properties of the sintered Ti-15Mo-6Zr and Ti-15Mo-6Zr-xCr alloys were investigated using scanning electronic microscopy (SEM) and bending and compression tests. The experimental results indicated that the microstructure and mechanical properties of these alloys changed as different Cr levels were added. The addition of small Cr levels further increased the β-phase stability, improving the properties of the Ti-15Mo-6Zr-xCr alloy. However, all of the alloys had good ductility, and the Ti-15Mo-6Zr-2Cr alloy had lower bending and compression moduli (31 and 23 GPa, respectively) than the Ti-15Mo-6Zr-based alloys (40 and 36 GPa, respectively). Moreover, the Ti-15Mo-6Zr-2Cr alloys exhibited higher bending and compression strength/modulus ratios, which were as large as 48.4 and 52.2, respectively; these were higher than those of the Ti-15Mo-6Zr-based alloy (41.3 and 33.6, respectively). In the search for a better implant material, β phase Ti-15Mo-6Zr-2Cr, with its low modulus, ductile properties, and reasonably high strength, is a promising candidate.

Development of new high performance Titanium alloys with Fe-addition for dental implants

“…5.4% less than Ti-12Mo-6Zr. Elashalakany et al (Elshalakany et al, 2017) also claimed that volumetric shrinkage for their alloy (Ti-15Mo-6Zr-xCr) is between 16-20% which is like our alloy. Delvat et al (Delvat et al, 2008) also claimed that dimensional loss of Ti-20Mo and Ti-40Mo are between (20-23)%.…”

“…Ti-6Al-7Nb with powder metallurgy has grain size is in range of (134 ± 17) μm at sintering temperature 1250ºC which is claimed by Bolzoni et al (Bolzoni et al, 2013) and this value is much more than our alloy. (Elshalakany et al, 2017). Fracture characteristics of these alloys are like our alloys which is prepared by powder metallurgy technique.…”

“…From the analysis, the standard of the element is of factory standard. From the EBSD results of Ti-12Mo-6Zr-2Cr prepared by elemental blend have α-phase on the grain boundary indicated by the color key of the standard triangle (Elshalakany et al, 2017). The (110)β and (111)β are the compact planes in Ti84Mo16 nitride structure (Gordin et al, 2010).…”

Magnesium in Synthesis of Porous and Biofunctionalized Metallic Materials

“…From Ti alloys, the most common for dental and orthopedic applications are materials formed by Ti, aluminum (Al) and vanadium (V) like Ti-6Al-4 V and other β-phasetype alloys as the ones with high contents of β-stabilizers (V, Cr, molybdenum (Mo), Fe, niobium (Nb), and tantalum (Ta)) [5][6][7][8][9][10][11][12]. However, several reports point to the V in the Ti-6Al-4 V as toxic [13,14], being a motivation for exploring further V-free options.…”

“…It has been widely reported that the porous surfaces assist on the fixations and ingrowth of organic tissue, improve the body fluid, reduce the mechanical mismatch due to lower elastic modulus values, and reduce the failure rate of implants [3]. Examples of the above are Ti and indium (In) as (Ti-In) [18], Ti-Mo [7][8][9], Ti, Nb and Tin (Sn) as Ti-Nb-Sn [10,19], Ti and zirconium (Zr) as Ti-Zr [20], and Ti and silver (Ag) as Ti-Ag [21] alloys. However, some of the previous systems employ alloying elements that are still not widely studied, being a reason why several in vivo tests of biocompatibility should be carried out to determine their biological feasibility.…”