Influence of Ti Powder Characteristics on the Mechanical Properties of Porous Ti Using Space Holder Technique

doi:10.1007/s40195-014-0051-5

Abstract

Abstract:

Porous Ti samples were fabricated by powder metallurgy technique using three kinds of Ti powder and the space holder of polymethyl methacrylate. The final morphological features and mechanical properties were described. Results show that there is only α-Ti phase in porous Ti samples. After sintering, the oxygen content of three porous Ti is increased from the range of 0.34–0.63 wt% to 0.95–1.3 wt%. The porous Ti prepared from the uneven powders with an average particle size of (22.75 ± 11.09) μm presents the largest micro-pore size, grain size, and oxygen content, which lead to the lowest strength and Young’s modulus.

Key words: Porous material, Powder metallurgy, Microstructure, Mechanical property

Boqiong LI, Xing LU. Influence of Ti Powder Characteristics on the Mechanical Properties of Porous Ti Using Space Holder Technique[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(2): 338-346.

Figures/Tables 10

Fig. 1 SEM micrographs of Ti powders A a, B b, C c, the particle size distribution of different powders d

Fig. 2 Metallographs of porous Ti made from different Ti powders: a powder A; b powder B; c powder C

Fig. 3 XRD patterns of porous Ti samples made from Ti powders A, B, and C

Fig. 4 SEM images and EPMA results of porous Ti made from different powders: a A; b B; c C

Table 1 Oxygen Contents in different Ti powders and porous Ti samples made from different Ti powders (wt%)

Powder	Ti powder	Porous Ti
A	0.50	0.95
B	0.67–0.89	1.30
C	0.76	1.10

Fig. 5 Nominal stress–strain curves during different testings of porous Ti samples made from different powders: a compression testing; b bending testing; c tension testing

Table 2 Mechanical properties of porous Ti samples made from different Ti powders

Powder	Compressive strength (MPa)	Tensile strength (MPa)	Bending strength (MPa)	Compressive Young’s modulus (GPa)	Tensile Young’s modulus (GPa)
A	200.00 ± 30.00	82.0 ± 5.7	433.92 ± 6.3	4.40 ± 0.33	4.80 ± 0.55
B	135.68 ± 12.77	38.0 ± 6.0	284.00 ± 3.50	3.46 ± 0.21	2.58 ± 0.45
C	186.81 ± 21.74	66.0 ± 24.7	350.20 ± 1.20	4.00 ± 0.24	3.60 ± 0.02

Fig. 6 SEM fractographs of the porous Ti made from powder A deformed by tension testing: a overall morphology; b feathery cleavage facets with secondary cracks (marked S); c intermediate magnification fractograph shows a few dimpled areas (marked D), the river pattern and fan-like cleaved facets and transcrystalline fracture along the colonies (marked T); d spherical attachment (marked SA) and cotton-shaped attachment (marked CA) on the macro-pore wall

Fig. 7 SEM fractographs of the porous Ti made from powder B deformed by tension testing: a overall morphology; b intermediate magnification fractograph showing the river pattern and fan-like cleaved facets; c feathery cleavage with secondary cracks along grain boundary (arrow); d terraced fracture surface with the macro-pore initiated failure (marked M), secondary cracks and attachments on the macro-pore wall; e a smooth cleavage facet with the macro-pore initiated failure and dimples along the grain boundaries; f a magnification smooth cleavage facet with micro-pore and the shear tip with microvoids

Fig. 8 SEM fractograph of the porous Ti made from powder C deformed by tension testing: a overall morphology; b intermediate magnification fractograph showing the macro-pore initiated failure, the river pattern and smooth fan-like cleaved facets with micro-pore and spherical attachment; c cleaved facets with cotton-shaped attachment and transcrystalline fracture along the colonies; d tear ridge with dimples

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