Formation of New Ti-based Metallic Glassy Alloys

Abstract

New Ti-based bulk glassy alloys were synthesized in a multi-component alloy system of Ti-Cu-Ni-Al-Zr-Si-B. In a wide composition range of Ti > 50 at%, single-phase glass rods with diameters up to 2.5 mm were prepared using a conventional copper-mold casting method. The new Ti-based glassy alloys show compressive strength above 1900 MPa. The plastic (serrated) strain under compression is lager than 0.01. The new Ti-based glass phase exhibits relatively high thermal stability with a large supercooled liquid region (ÁT x ) above 50 K. These glassy alloys, however, exhibit complex crystallization behavior characterized by multiple exothermic-reaction peaks on their differential scanning calorimeter (DSC) curves. The glass-forming ability of this complex system is discussed on the basis of knowledge available for bulk glass formation.

Review on the Research and Development of Ti-Based Bulk Metallic Glasses

“…In this section, we will focus on the effect of alloying on the GFA of Ti-based BMGs. Table 3 summarizes the effects of different alloying elements on the thermal stability (reflected by ∆Tx) and GFA of Ti-based BMGs [39,49,52,54,57,79,87,[90][91][92]99,[105][106][107][108]110,117,[125][126][127][128][129][130]. …”

Effects of Ta on Microstructure and Mechanical Property of Ti-Zr-Cu-Pd-Ta Alloys

“…10) In addition, Ti-based bulk metallic glasses are high promising biomaterials due to high corrosion resistance and good biocompatibility. But most of Ti-based bulk metallic glassy alloys with high glass-forming ability contain some toxic elements of Ni and/or Be, 11,12) which cause an allergy, cancer or other diseases, resulting in limitation of applications of Ti-based bulk metallic glasses to biomedical fields. Recently, new Ti-based bulk metallic glass composite without toxic elements has been synthesized in Ti-Zr-CuPd alloy system, which exhibit high corrosion resistance and good combination of strength and ductility, 13) implying a high potential as biomaterials.…”

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

“…Several alloying elements including Zr, Hf and Si have been reported to increase the GFA of Ti-Cu-Ni ternary alloys. 14) Experimental observations of atomic size distribution of many BMGs suggest that amorphous alloys typically have at least one alloying element with a larger atomic radius and at least one alloying element with a smaller radius relative to the base element. [15][16][17] Based on these observations, we choose the elements of Zr and Hf, which have larger atomic sizes (0.1602 nm for Zr and 0.1580 nm for Hf) compared to that of Ti (0.1462 nm), as the candidate alloying elements.…”