Near-Net Forming Complex Shaped Zr-Based Bulk Metallic Glasses by High Pressure Die Casting

Abstract

Forming complex geometries using the casting process is a big challenge for bulk metallic glasses (BMGs), because of a lack of time of the window for shaping under the required high cooling rate. In this work, we open an approach named the “entire process vacuum high pressure die casting” (EPV-HPDC), which delivers the ability to fill die with molten metal in milliseconds, and create solidification under high pressure. Based on this process, various Zr-based BMGs were prepared by using industrial grade raw material. The results indicate that the EPV-HPDC process is feasible to produce a glassy structure for most Zr-based BMGs, with a size of 3 mm × 10 mm and with a high strength. In addition, it has been found that EPV-HPDC process allows complex industrial BMG parts, some of which are hard to be formed by any other metal processes, to be net shaped precisely. The BMG components prepared by the EVP-HPDC process possess the advantages of dimensional accuracy, efficiency, and cost compared with the ones formed by other methods. The EVP-HPDC process paves the way for the large-scale application of BMGs.

Drilling Characteristics of Bulk Metallic Glass in Various Cooling Conditions

“…In this paper, the workpiece was made of classic Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vit1) BMG. The shape was rectangular plate with (100mm×50mm×2 mm), provided by Eontech New Materials Co., Ltd. and the preparation method available from the literature [6]. Moreover, the BMG stress-strain curves at a constant strain rate of 0.01 s -1 and various temperatures are shown in Fig.…”

“…3 BMG holes drilled at various cutting conditions. Horizontal number (1-9) is the drilling sequence, vertical number (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) corresponds to the dry drilling at n = 1000 r/min to 5000 r/min (1-5), 6-10 is the wet drilling, and 11-15 is the frozen drilling. SU8220 Scanning Electron Microscope (SEM, Hitachi Co., Ltd) was used to observe the hole micro-morphology and worn drill bits.…”

“…When it comes to producing BMG parts, high pressure die casting technology is the primary method in the industry [6][7][8]. However, medical appliances such as surgical instruments and implants usually have a complex shape and high require dimensional accuracy [9,10].…”

Ab Initio Molecular Dynamics Study of the Structure and Properties of Nb-Doped Zr-Cu-Al Amorphous Alloys

“…However, the applications of many BMG systems are still limited owing to their room-temperature brittleness and low glass-forming ability (GFA) [2]. ZrCu-based BMGs with high GFA, relatively high room-temperature compression plasticity [3], low cost (no precious metals) and low toxicity have promoted the application of BMGs in a wide range of areas, such as consumer electronics, sports equipment, and biomedical instruments [4][5][6][7].…”

Effect of Niobium and Yttrium Modified Ti-Based Bulk Amorphous Alloy on Correlation of Plastic Deformation Energy and Ductility

“…Bulk amorphous alloys have excellent properties such as high strength, high hardness and low modulus of elasticity, making them a very good application prospect as structural materials [1][2][3][4].Researchers have developed multi-component bulk amorphous alloys such as Pd-based, Zr-based, Fe-based, Co-based, Ni-based and Ti-based [5][6][7]. However, the plastic rheology of amorphous alloys imited to the shear bands is achieved by localized shear deformation [8,9].…”