Effects of Nitrogen on the Glass Formation and Mechanical Properties of a Ti-Based Metallic Glass

Abstract

Effects of nitrogen addition on glass formation and mechanical properties of the Ti 42.5 Cu 40 Zr 10 Ni 5 Sn 2.5 metallic glass were systematically investigated. It was found that a small amount of nitrogen addition facilitated the glass formation by suppressing formation of the competing eutectic structure. Unlike large atomic size elements such as Hf and Pd which usually deteriorate specific strength, nitrogen can also increase the specific strength of the current Ti-based BMGs. The results are not only helpful for understanding glass-forming ability in general, but also useful in developing cost-effective, high-performance Ti-based bulk metallic glasses with enhanced glass-forming ability.

Enhanced Mechanical Properties, Corrosion Behavior and Bioactivity of Ti-based Bulk Metallic Glasses with Minor Addition Elements

“…Corrosion behavior was investigated from the view of potential dynamic polarization testing for melt-spun samples. In 0.144 mol/L NaCl solution, all of the melt-spun samples are spontaneously passivated with a passive current density between 10 -7 and 10 -8 A/cm 2 (Fig. 3).…”

“…Bulk metallic glasses (BMGs) as novel metallic materials were rapidly developed in the past decades because of unique properties compared with conventional polycrystalline alloys [1]. Ti-based BMGs are expected as one of the most important metallic materials in orthopedics and dental surgery due to their low Young's modulus, high fracture strength, excellent strength-to-weight ratio, good corrosion resistance and superior biocompatibility of titanium [1][2][3][4]. Recently, the developments of Ni-free Ti-Zr-Cu-Pd and Ti-Zr-Cu-Pd-Sn BMGs with high glassforming ability (GFA) make it possible to create newgeneration metallic biomedical materials with acceptable properties [5][6][7][8][9][10].…”

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

“…As Ti possesses similar properties as Zr and easily reacts with oxygen, it can be inferred that oxygen introduced from the raw materials or the low vacuum may have a negative effect on GFA of Ti-based BMGs. Experimental results indicate that the GFA of Ti 42.5 Cu 40 Zr 10 Ni 5 Sn 2.5 is sensitive to the nitrogen doping level [125]; with the addition of less than 0.1 atom % nitrogen, the GFA is improved because of the suppression of the formation of a competing eutectic structure. However, if the nitrogen concentration exceeds 0.1 atom %, the formation of quasicrystals can be promoted, and the GFA is deteriorated.…”

“…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 ∆T x ) 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]. …”

A Novel, Amorphous, Non-equiatomic FeCrAlCuNiSi High-Entropy Alloy with Exceptional Corrosion Resistance and Mechanical Properties

“…Metallic glasses (MGs) are a type of advanced materials with long-range disorderly and short-range orderly structural features. Compared with crystalline alloys, MGs usually do not have the grain boundaries, dislocations and stacking faults, endowing them with ultrahigh fracture strength, superior elastic limit and excellent corrosion resistance [1][2][3]. Recently, Al-Y-Ni MGs have been prepared, exhibiting a tensile fracture strength of more than 1000 MPa combined with good bend ductility; the tensile strength is almost two times as high as that of conventional Al-based crystalline alloys [4,5].…”