Effects of annealing on mechanical properties and degradation behavior of biodegradable JDBM magnesium alloy wires

Mg-Nd-Zn-Zr magnesium alloy (JDBM) has been studied widely as biodegradable medical material. To process high quality JDBM wires, effects of annealing on the mechanical properties and degradation behavior after drawing were studied by microscopic observations, tensile and immersion tests. The as-extruded wires with a diameter of 3 mm could be drawn up to 9 passes without annealing until 125% cumulative drawing deformation. Complete recrystallization occurred after annealing at 325 degrees C for 30 min, 350 degrees C for 5 min or 450 degrees C for 3 min, respectively. Room temperature tensile tests and simulated body fluid immersion tests showed that annealing at slightly elevated temperature for short time could obtain better properties due to the finer grain size and more dispersive distribution of precipitates. For this study, annealing at 350 degrees C for 5 min is the best parameters which can be utilized to further fabricate fine wires.

Automated summary

Research shows that annealing at slightly elevated temperature for short time can improve the properties of JDBM wires, such as finer grain size and more dispersive distribution of precipitates. Annealing at 350 degrees C for 5 minutes is identified as the optimal parameters for further fabrication of fine wires.