Abstract
The tensile behaviour of the biocompatible alloy Mg-1Zn-0.2Ca (in wt.%) in the fine-grained state, obtained by severe plastic deformation via multiaxial isothermal forging, has been investigated in a wide range of temperatures (20 ÷ 300) °C and strain rates (5 × 10−4 ÷ 2 × 10−2) s−1 with the measurements of acoustic emission (AE). The dependences of mechanical properties, including the yield stress, ultimate strength, ductility, and the strain-hardening rate, on the test temperature and strain rate, were obtained and discussed. It is shown for the first time that an acoustic emission method is an effective tool for in situ monitoring of the dynamic recrystallisation (DRX) process. The specific behaviour of the acoustic emission spectral density reflected by its median frequency as a function of strain at various temperatures can serve as an indicator of the DRX process’s completeness.
Highlights
Due to their exceptional properties’ profile, magnesium alloys attract burgeoning attention for various applications that span from light vehicle fuel-saving transportation to consumable electronics and biomedical devices
The reflexes of CaO oxide and the CaZn13 phase were found in the X-ray diffraction (XRD) pattern
Mg alloys in a wide range of temperaunderlying the mechanical behaviour of wrought Mg alloys in a wide range of temperatures tures and strain rates, we investigated mechanicalresponse responseofofthe thelow-alloyed low-alloyed fineand strain rates, we investigated thethe mechanical fine-grain grain biomedical magnesium alloy Mg-1Zn-0.2Ca fabricated via multiaxial isobiomedical magnesium alloy Mg-1Zn-0.2Ca fabricated via multiaxial isothermal thermal forging and tested in tension with the concomitant measurements of the wideforging and tested in tension with the concomitant measurements of the wideband acoustic band acoustic emission signal
Summary
Due to their exceptional properties’ profile, magnesium alloys attract burgeoning attention for various applications that span from light vehicle fuel-saving transportation (aerospace, automotive, high-speed rail transport, etc.) to consumable electronics and biomedical devices. The requirements for biomedical materials are stringent because, besides biocompatibility, non-toxicity, controlled bio-degradability, etc., these materials are supposed to hold the integrity of implanted structures over the whole period of healing, i.e., while providing the necessary mechanical support to healing tissues, they must possess reasonably high resistance to static and dynamic loads in body fluids. These requirements imply that the materials aimed at biomedical applications are supposed to have: (1) (2). Remaining ductile is a prime requirement for the final product as shape correction and adjustment may be needed during location-specific deployment
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