首页|热变形可生物降解镁基合金的微观组织特征和力学性能研究进展

热变形可生物降解镁基合金的微观组织特征和力学性能研究进展

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镁合金凭借与人骨相近的弹性模量、体内自发的可降解性及优异的生物相容性,在生物医用领域表现出巨大的发展潜力.然而,镁合金室温塑性成形差及绝对抗拉强度/屈服强度低,限制了其广泛应用.热变形作为一种有效改善镁合金力学性能的方式,具有细化晶粒及破坏连续大尺寸第二相等特征,通过引入高密度位错进而显著提高材料强度和塑性.因此,从热变形医用镁合金组织演变特征出发,以变形方式为分类依据,综述了近年来医用镁合金热变形的研究动态.概述了轧制、锻造、挤压、高压扭转等4种典型热变形工艺的差异性特征.在此基础上,阐述了不同热变形工艺下医用镁合金的晶粒细化机制,动态再结晶过程和位错增殖对力学性能的影响规律.进一步归纳了热变形医用镁合金微观组织结构及力学性能的本质关联.
Research Progress of Microstructure Characteristics and Mechanical Properties of Hot-Deformed Biodegradable Mg-based Alloys
Magnesium alloys offer a lot of potential in the biomedical fields,due to their suitable elastic modulus for human bone,spontaneous degradability,and excellent biocompatibility,while low absolute tensile or yield strength and barren plastic abilities at room temperature significantly restrict their applications.As a successful method of enhancing mechanical properties,the hot deformation process can not only refine the grain sizes and broken sediments,but also introduce the high-density dislocations and change the texture orientation to improve the strength and plasticity.Based on the microstructure evolution laws,the latest research progress of Mg-based alloys under various hot deformation processes was reviewed.The differences in the deformation methods of rolling,forging,extrusion,and high-pressure torsion were compared.Under various hot deformation methods,the mechanism of grain refinement and the impact of dynamic recrystallization and dislocation propagation on the mechanical properties of Mg alloys were discussed.In addition,the relationships between microstructure and mechanical properties of hot-deformed Mg alloys were summarized.

degradable Mg alloyshot deformationsecond precipitationsgrain refinementmechanical properties

张源、杨煜卓、刘芸、刘薇、田亚强、陈连生

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华北理工大学冶金与能源学院,河北唐山 063210

华北理工大学现代冶金技术教育部重点实验室,河北唐山 063210

医用镁合金 热变形 第二相 晶粒细化 力学性能

Central Government Guided Local Science and Technology Development Fund Project河北省自然科学基金Open Fund of State Key Lab of New Metal MaterialsScience and Technology Project of Tangshan

226Z1004GE20202091532020-Z1220130205b

2024

10.12442/j.issn.1002-185X.E20230027

稀有金属材料与工程
中国有色金属学会,中国材料研究学会,西北有色金属研究院

稀有金属材料与工程

CSTPCD北大核心
影响因子：0.634
ISSN：1002-185X
年,卷(期)：2024.53(5)
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