New Ti-Based Bulk Glassy Alloys with High Glass-Forming Ability and Superior Mechanical Properties

Abstract

Ti-based glassy alloy rods with diameters up to 5 mm were prepared for Ti 41:5 Zr 2:5 Hf 5 Cu 42:5 Ni 7:5 Si 1 in a mutli-component system of (Ti, Zr, Hf)-(Cu, Ni)-Si by conventional copper mold casting. The new multi-component glassy alloy exhibits moderate thermal stability with a supercooled liquid region (ÁT x ) above 50 K. The glass transition temperature (T g ), crystallization temperature (T x ), melting temperature (T m ), liquidus temperature (T l ), and the reduced glass transition temperature (T g =T l ) are 680 K, 730 K, 1143 K, 1199 K and 0.57, respectively. The cast glassy alloy exhibits compressive strength of 2080 MPa, tensile strength of 2040 MPa and Young's modulus of 100 GPa. The reason for the high glass-forming ability (GFA) of the Ti-based multi-component alloy is discussed on the basis of knowledge available for bulk glass formation.

Structural relaxation of Ti40Zr25Ni8Cu9Be18 bulk metallic glass

“…Ti-based bulk metallic glasses (BMGs), as promising lightweight structural materials, have attracted more and more attention during recent years [3][4][5][6][7][8][9][10][11][12]. Ti 40 Zr 25 Ni 8 Cu 9 Be 18 BMG, as one of the best Ti-based BMGs known today, was found to exhibit a good combination of glass forming ability (GFA, the maximum diameter could be 8 mm) and mechanical properties (high compressive strength and large compressive plastic strain) [9,13,14], which could be a potential structural material.…”

Recent Progress in Ti-Based Metallic Glasses for Application as Biomaterials

“…43) High yield strength of about 2000 MPa, low Young's modulus of about 80 GPa and distinct plastic strain of about 1.510% were achieved in 1% noble element-added alloys. In addition, only 1 at% Si addition was effective in facilitating glass formation for the Ti-based glassy alloys, 24,44) and minor Si addition was favor of enlarging the super liquid region (SCL). The most convenient element to be added to TiZrCuPd glassy alloys has been shown to be Nb.…”

Effect of Nanocrystal Distribution on Mechanical Properties of Ti-Based Metallic Glasses

“…The homogeneous dispersion of nanocrystals in metallic glasses is one method for preparing metallic glasses that undergo plastic deformation by the activation of shear bands. Recently, Ti-based bulk metallic glasses exhibiting plastic deformation have been reported, 6,11) although the microstructures of the materials have yet to be clarified. If the plastic deformation in Ti-based bulk metallic glasses is caused by the dispersion of nanocrystals, it may be possible to increase the plastic strain by optimizing the density, distribution, and morphology of the nanocrystals.…”

“…Various kinds of Ti-based amorphous aloys and metallic glasses have been developed, [1][2][3][4][5][6][7][8][9][10][11][12] due mainly to the light weight and high corrosion resistance properties of Ti. Tibased metallic glasses are therefore attractive candidates for light-weight, high-strength and biocompatible structural materials.…”