A New Centimeter‐Sized Ti‐Based Quaternary Bulk Metallic Glass with Good Mechanical Properties

Abstract

Ti-based bulk metallic glasses (BMGs) have attracted much attention due to their outstanding properties such as high specific strength and good anti-corrosion properties. [1,2] Among the typical light-metal-based BMGs, Al-based BMGs possess poor glass-forming ability (GFA) with a maximum size of only 1 mm, [3,4] while most Mg-based BMGs are highly brittle even under compression. [5,6] By contrast, Ti-based BMGs have a higher probability for practical application than Mg-based and Al-based BMGs. In recent years, a number of new Ti-based BMGs have been discovered and some of them exhibit superior GFA with a critical size larger than 1 cm, such as Ti-Zr-Cu-Ni-Be [7][8][9] and Ti-Zr-Cu-Pd-Sn. [10] However, the developed centimeter-sized Ti-based alloys have complicated composition with at least five constituent elements. Then it is meaningful to explore Ti-based alloys with high GFA and fewer constituent elements, just like these in Pd-based glassy alloys (e.g., Pd-Si, [11] Pd-Cu-Si, [12] and Pd-Ni-Cu-P [13] BMGs) despite of that it would be difficult. According to our knowledge, Ti 45 Zr 20 Be 35 and Ti 40 Zr 25 Be 35 glassy alloys [14] with a critical diameter of 6 mm, may possess the best GFA in Ti-based ternary systems. The largest size of Ti-based quaternary BMGs is also only 8 mm obtained in Ti-Zr-Be-Cr [14] and Ti-Zr-Be-V [15] alloy systems. So further COMMUNICATIONWe report a new Ti 40 Zr 26 Be 28 Fe 6 bulk metallic glass designed by slightly decreasing Ti/Zr concentration ratio based on the newly developed Ti 41 Zr 25 Be 28 Fe 6 bulk metallic glass. The Ti 40 Zr 26 Be 28 Fe 6 glassy alloy exhibits high thermal stability and the width of the supercooled liquid region for this alloy is up to 100 K. By conventional copper mold suction casting method, Ti 40 Zr 26 Be 28 Fe 6 fully glassy rod with a diameter of 10 mm can be successfully obtained. Ti 40 Zr 26 Be 28 Fe 6 glassy alloy also possesses excellent mechanical properties such as a high specific strength of 4.03 Â 10 5 Nm kg À1 and an obvious compressive plastic strain of 7.4%, which make it possible to be used as novel aerospace materials.ADVANCED ENGINEERING MATERIALS 2013, 15, No. 8

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

“…Based on experimental results, the best glass former was located at Ti 41 Zr 25 Be 34 , which is close to the predicted composition by binary-eutectic rule (Ti 41 Zr 32 Be 27 ). Then, a series of Ti-Zr-Be-(Fe, Al, Ag, Cu, Ni, V, Cr) BMGs [79][80][81][87][88][89][90][91][92][93][94] with improved GFA was reported, and some of the developed quaternary alloys were found to possess a larger critical size up to a centimeter scale. A pseudo Ti-Zr-Cu-Ni-Be system, which possesses a much higher GFA, was discovered based on the Ti-Zr-Be system.…”

“…For Ti-based BMGs, this argument is supported by some examples listed in Table 3. For example, in order to improve the GFA of a Ti 41 Zr 25 Be 34 alloy, the alloying quantities of Fe, Al, Cu, Ni, or Cr have to be over 5 atom % [79,[87][88][89][90][91][92]. However, there are contrary examples.…”

“…A simple but effective way is replacing one of the constituent elements with alloying elements that possess a higher Poisson's ratio. Gong et al investigated the alloying effect on the compressive plasticity of Ti-Zr-Be BMGs [87][88][89][90][91][92][93][94]. Among the constituent elements in the Ti-Zr-Be system, Be possesses a very low Poisson's ratio of 0.032, while Zr possesses a high Poisson's ratio of 0.34.…”

Structure of the glass-forming metallic liquids by ab-initio and classical molecular dynamics, a case study: Quenching the Cu60Ti20Zr20 alloy

“…The unique physical, mechanical, and corrosion properties of these novel materials indeed enable a variety of applications [2][3][4] . A particular attention has been paid to the BMGs based on late transition metals, especially in the Cu-based family 5,6 , including alloys with Zr .…”

Improved Plasticity of Ti-Based Bulk Metallic Glass at Room Temperature by Electroless Thin Nickel Coating

“…The specific strength values of Ti-based BMGs are universally over 3.5 × 10 5 N m kg −1 , which is significantly higher than the typical titanium alloy Ti-6Al-4V (2.6 × 10 5 N m kg −1 ) [4,5]. Ti-based BMGs also have many other outstanding properties, including good corrosion resistance [6,7], good biocompatibility [8][9][10], and good glass-forming-ability (GFA) [11,12], having potential applications in the fields of consumer electronics, automotive, biomedical devices, aerospace, and so on [13,14].…”