Effect of residual chips on the material removal process of the bulk metallic glass studied by in situ scratch testing inside the scanning electron microscope

Abstract

Research on material removal mechanism is meaningful for precision and ultra-precision manufacturing. In this paper, a novel scratch device was proposed by integrating the parasitic motion principle linear actuator. The device has a compact structure and it can be installed on the stage of the scanning electron microscope (SEM) to carry out in situ scratch testing. Effect of residual chips on the material removal process of the bulk metallic glass (BMG) was studied by in situ scratch testing inside the SEM. The whole removal process of the BMG during the scratch was captured in real time. Formation and growth of lamellar chips on the rake face of the Cube-Corner indenter were observed dynamically. Experimental results indicate that when lots of chips are accumulated on the rake face of the indenter and obstruct forward flow of materials, materials will flow laterally and downward to find new location and direction for formation of new chips. Due to similar material removal processes, in situ scratch testing is potential to be a powerful research tool for studying material removal mechanism of single point diamond turning, single grit grinding, mechanical polishing and grating fabrication

Nanosecond pulsed laser irradiation induced hierarchical micro/nanostructures on Zr-based metallic glass substrate

“…Thus, oxidation and crystallization of MGs may occur [20] which probably affect their amorphous performances [21,22], but this kind of effects is dependent of the properties and volume fraction of the crystalline phases [21][22][23] as well as the sample preparation and evaluation methods [24,25]. In addition, high local temperature will also increase the adhesion between the chip and tool, leading to the formation of built-up edge on the rake face, and thus affect the subsequent cutting process [16,26]. Hence, fabrication of micro/nanostructured surfaces on MGs by mechanical machining is challenging.…”

An overview on the conventional and nonconventional methods for manufacturing the metallic glasses

“…It exists some sporadically studies of the machining characteristics of MGs during cutting and drilling and found that although mechanical machining of MGs can obtain high dimensional accuracy and surface quality, some problems, such as oxidation and crystallization during high speed machining, still exists [16][17][18][19][20].…”

Forward and Reverse Movements of a Linear Positioning Stage Based on the Parasitic Motion Principle

“…From another perspective, the linear positioning stage has low manufacturing and assembling requirements. These problems do not affect applications of the linear positioning stage in some places such as applications in in situ micro/nanomechanical testing in [6], which just requires the large motion range, various movement velocities and stepping displacement, and forward and reverse movements. Of course, for specific applications requiring high repeat positioning accuracy, improving manufacturing and assembling quality can further improve its output performances.…”

“…Precision positioning stages based on piezoelectric stacks and flexure hingebased compliant mechanisms are playing more and more important roles in scanning systems [1], precision and ultraprecision machining [2,3], micromanipulators [4,5], micro/nanomechanical testing [6,7], and so on. For different application requirements, kinds of driving principles have been proposed, such as the piezoelectric stack direct driving principle [8], the inchworm driving principle [9], the impact driving principle [10], and the stick-slip driving principle [11].…”

“…However, the symmetrical structure also increases dimensions of the PMP linear actuator, and its size reaches 130 mm × 50 mm × 26 mm, which lowers the flexibility of its applications. For example, the dimension along -axis of the in situ scratch testing device in [6] is strongly dependent on dimensions of the PMP linear actuator. If dimensions of the PMP linear actuator can be reduced but its functions still maintained, applications of the PMP linear actuator will be more flexible.…”