Preparation of Open-Cell Porous Zr-Based Bulk Glassy Alloy

Abstract

A Zr-Nb-Al-Ni-Cu porous bulk glassy alloy was prepared by a melt infiltration technique using La 2 O 3 compact. The alloy has open-cell structure with a pore size of about 50 micrometer and roughened cell wall structure. The yield strength and Young's modulus of the porous alloy are 180 MPa and 17 GPa, respectively, which are coincident with those for human cortical bone. The porous alloy exhibited good corrosion resistance in a simulated human body fluid, indicating the possibility of application as biomaterials.

Amorphous Zr-Based Foams with Aligned, Elongated Pores

“…Fig. 8-Uniaxial compressive stress-strain curves for published Zr-based foams produced using He expansion (H, p = 11 pct), [37] W wire replication (W, p = 60 pct), [13] La 2 O 3 replication (O, p = 60.4 pct), [12] spark plasma sintering (S, p = 4.7, 33.5 pct), [18] ECAE (E, p = 59.5 pct, 63 pct), and BaF 2 replication (F, p = 72 to 82 pct). [6] Whereas the present VitW foams and the honeycomb structure produced by W wire dissolution both show aligned, highly elongated pores with similar porosity (p = 59.5 to 63 pct and 60 pct, respectively), they display yield strength differing by one order of magnitude (61 vs 820 MPa) and compressive ductility by two orders of magnitude (60 vs 0.6 pct).…”

“…[36] Figure 8 compares compressive stress-strain curves for the present VitW foams, with those of previously published Zr-based BMG foams with equiaxed, open porosities (p = 4.7 to 78 pct) made by a variety of methods: He expansion, [37,38] spark plasma sintering of powders, [18] and salt replication. [6,12] Also shown in Figure 8 is a cast, amorphous Zr-based honeycomb produced by dissolution of aligned W wires within a Vit106a matrix, [13] with the resulting cylindrical pores (p = 60 pct) parallel to the axis of loading. Compressive yield strengths for the preceding Zr-based BMGs are compiled in Figure 9.…”

Recent Development and Applications of Bulk Glassy Alloys

“…Porous bulk glassy alloys have attracted considerable interest because of the possibility of changing significantly various fundamental properties such as density, elastic modulus, yield strength, ductility, specific surface area, etc. The data on porous bulk glassy alloys have been obtained for Pd‐based alloys including spherical and polyhedral pores 73–76 and Zr‐based alloys including polyhedral pores 77 . The early work performed by Schroers et al 73 in 2003 has been followed up by a more thorough study in the literature 78 .…”

“…The data on porous bulk glassy alloys have been obtained for Pd-based alloys including spherical and polyhedral pores [73][74][75][76] and Zr-based alloys including polyhedral pores. 77 The early work performed by Schroers et al 73 in 2003 has been followed up by a more thorough study in the literature. 78 There have been no data on the formation of Zr-based porous bulk glassy alloys including spherical pores.…”

Amorphous Hf-based foams with aligned, elongated pores

“…Porous BMGs are much weaker than their dense counterparts, but have much higher compressive ductility [12][13][14] with non-catastrophic damage accumulation [15]. Most current BMG foams were created by liquid state processing, e.g., by infiltration of a temporary space-holder phase [14,16], expansion of entrapped gas in the liquid phase [17,18] or in the undercooled liquid region [19,20]. These liquid routes become difficult with Hf-based BMGs which have lower glass forming abilities and higher melting temperatures than their Zr-based BMG counterparts [2,21].…”