Abstract
Bulk metallic glass matrix composites (BMGMCs) are a new class of metal alloys which have significantly increased ductility and impact toughness, resulting from the ductile crystalline phases distributed uniformly within the amorphous matrix. However, the 3D structures and their morphologies of such composite at nano and micrometre scale have never been reported before. We have used high density electric currents to thermally shock a Zr-Ti based BMGMC to different temperatures, and used X-ray microtomography, FIB-SEM nanotomography and neutron diffraction to reveal the morphologies, compositions, volume fractions and thermal stabilities of the nano and microstructures. Understanding of these is essential for optimizing the design of BMGMCs and developing viable manufacturing methods.
Highlights
Be used to heat BMGs into the supercooled liquid state without causing crystallisation; in this state, near net-shape thermoplastic processing can be applied
Lee et al.[13] studied the thermal stability of the LM2A2 at low temperature, and found that the body centred cubic (BCC) dendritic β -Zr phase is unstable below 300 °C because Zr tends to form the hexagonal close packed (HCP) crystal structure in low temperature
The thermal stability of the DH3 Bulk metallic glass matrix composites (BMGMCs) under thermal shock induced by high density electric current, and the corresponding 3D structure of the crystalline dendrites, the amorphous matrix and the newly formed phases due to different thermal shock conditions are presented in this paper
Summary
Be used to heat BMGs into the supercooled liquid state without causing crystallisation; in this state, near net-shape thermoplastic processing can be applied. Lee et al.[13] studied the thermal stability of the LM2A2 at low temperature (around 300 °C in isothermal conditions), and found that the body centred cubic (BCC) dendritic β -Zr phase is unstable below 300 °C because Zr tends to form the hexagonal close packed (HCP) crystal structure in low temperature. They found that the BCC β -Zr phase is stable at high temperatures (~600 °C), while the amorphous matrix crystallises at this temperature during isothermal heat treatment. The thermal stability of the DH3 BMGMCs under thermal shock induced by high density electric current, and the corresponding 3D structure of the crystalline dendrites, the amorphous matrix and the newly formed phases due to different thermal shock conditions are presented in this paper
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