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采用快速凝固(RS)技术制备了厚度小于80μm,具有细微组织的Mg-6.0%Zn-1.0%Y-0.6%Ce-0.6%Zr合金薄带,薄带经往复挤压(RE)4道次后,制成Φ35 mm坯料,坯料被进一步正挤压(EX)成Φ2.08 mm~Φ1.55 mm表面光洁的细丝。用SEM和STEM分析组织,用In-stron 5500R和弯曲试验装置测试机械性能。细丝基体晶粒直径为~1μm。一类强化相颗粒的平均直径为0.25μm,另一类<50 nm。变形态细丝抗拉强度和延伸率分别为335 MPa和13%;经过300℃保温10 min,然后水冷处理,抗拉强度和延伸率分别为403 MPa和12%。材料的临界弯曲直径为~6.28 mm,压应力是细丝弯曲断裂的控制因素。
The microstructure of Mg-6.0% Zn-1.0% Y-0.6% Ce-0.6% Zr alloy ribbon with thickness less than 80μm and microstructure was prepared by rapid solidification (RS) After that, a Φ35 mm billet was made and the billet was further extruded (EX) into smooth filaments of Φ2.08 mm ~ Φ1.55 mm. Tissue was analyzed by SEM and STEM, and the mechanical properties were tested using an In-stron 5500R and a bending tester. The diameter of the filament base grains was ~1 μm. The average diameter of a class of strengthening phase particles is 0.25μm, the other is less than 50 nm. The tensile strength and elongation of the deformed filaments were 335 MPa and 13%, respectively. The tensile strength and elongation of the modified filaments were 403 MPa and 12% after being kept at 300 ℃ for 10 min and then water-cooled. The critical bending diameter of the material is ~ 6.28 mm, and compressive stress is the controlling factor for filament bending fracture.