Micro injection of metallic glasses parts under ultrasonic vibration

doi:10.1016/j.jmst.2016.10.012

Abstract

Abstract:

This work investigates the evolution of structure and mechanical performance of metallic glasses (MGs) under a proposed rapid forming approach. Through the unique ultrasonic-assisted micro injection method, micro MGs parts with fine dimensional accuracy were successfully fabricated. The temperature during the micro injection is higher than the glass transition temperature and lower than the crystallization temperature. Differential scanning calorimeter curve and X-ray diffraction pattern show that the MGs micro parts keep the amorphous nature after the ultrasonic-assisted micro injection. Our results propose a novel route for the fast forming of MGs and have promising applications in the rapid fabrication of micro scale products and devices.

Key words: Metallic glasses, Micro injection, Ultrasonic vibration

Liang X., Ma J., Wu X.Y., Xu B., Gong F., Lei J.G., Peng T.J., Cheng R.. Micro injection of metallic glasses parts under ultrasonic vibration[J]. J. Mater. Sci. Technol., 2017, 33(7): 703-707.

Figures/Tables 5

Fig. 1. Schematic diagram of UMIM setup (1—Ultrasonic sonotrode; 2—Cover plate with charging barrel; 3—Mold insert with microstructure; 4—Baseplate; 5—MGs micro-ribbons; 6—K-type thermocouple; 7—Resistance heating furnace; 8—Mechanical testing system).

Fig. 2. SEM images of the samples: (a) and (b) are the micro cavities with microstructure; (c) is the cross-section of UMIM part; (d), (e) and (f) are UMIM parts.

Fig. 3. XRD (a) and DSC (b) curves of the UMIM part.

Fig. 4. Distribution of molulus Er and hardness H of the La-based ribbons (a) and the UMIM part (b). The black solid line is the mean value of Er, and the blue short dash line is the mean value of H.

Fig. 5. Temperature curve of MGs micro-ribbons during UMIM.

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