挤压态阻燃Mg-3Sm-1Gd-1Ca-0.5Zr合金微观组织和力学性能研究

董飞虎; 王胜; 楚志兵; 程丽任; 车朝杰; 王子

doi:10.3969/j.issn.1674-6457.2025.11.017

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精密成形工程 ›› 2025, Vol. 17 ›› Issue (11) : 178-189. DOI: 10.3969/j.issn.1674-6457.2025.11.017

轻合金成形

挤压态阻燃Mg-3Sm-1Gd-1Ca-0.5Zr合金微观组织和力学性能研究

董飞虎^1,2, 王胜^2,3, 楚志兵^1,*, 程丽任², 车朝杰^1,2, 王子⁴

作者信息 +

Microstructure and Mechanical Properties of Extruded Flame Retardant Mg-3Sm-1Gd-1Ca-0.5Zr Alloy

DONG Feihu^1,2, WANG Sheng^2,3, CHU Zhibing^1,*, CHENG Liren², CHE Chaojie^1,2, WANG Zi⁴

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摘要

目的在传统EV31合金的基础上,开发了Mg-3Sm-1Gd-1Ca-0.5Zr（EVX311）合金,对挤压态合金的微观组织、力学性能、阻燃性进行研究。方法采用挤压比为20∶1、温度为350 ℃、挤压速度为1 mm/min的热挤压工艺制备了Mg-3Sm-1Gd-1Ca-0.5Zr（EVX311）挤压板。结果合金中含有Mg₂Ca、Mg₃RE、Mg₅RE析出相;挤压态合金展现出很强的{0001}基面织构,在微观中呈现“双峰织构”通过透射电镜分析,观察到位错密度差引起的晶界弓出、晶粒内高密度位错聚集、微米级第二相促进形成动态再结晶现象（PSN）;挤压态合金屈服强度达217.06 MPa,在拉伸作用下出现了屈服平台,通过对拉伸断口进行观察分析,得出断裂机理为混合型断裂;挤压态合金燃点达到894 ℃。结论挤压态合金的EBSD特征是含有大量动态再结晶的细晶组织;屈服平台的出现可能与基体中溶质原子Ca以及位错的钉扎-脱钉的循环交互作用有关;合金的高燃点与Ca和稀土元素所形成的致密高抗氧化性薄膜密切相关,与其他阻燃合金相比,本合金具有元素含量少、燃点高的优势。

Abstract

The work aims to develop the Mg-3Sm-1Gd-1Ca-0.5Zr (EVX311) alloy based on the traditional EV31 alloy, to study the microstructure, mechanical properties, and flame retardancy of the alloy in extruded state. Mg-3Sm-1Gd-1Ca-0.5Zr (EVX311) extruded plate was prepared by hot extrusion process with extrusion ratio of 20∶1, temperature of 350 ℃ and extrusion speed of 1 mm/min. The alloy contained Mg₂Ca, Mg₃RE, and Mg₅RE precipitation phases and the extruded alloy exhibited strong {0001} basal weave, and "bimodal structure" in the microscopic view. By transmission electron microscopy, the grain boundary bowing out due to the difference in dislocation density, high-density aggregation of dislocations within the grain, and dynamic recrystallization (PSN) phenomenon facilitated by a second phase with a micrometer scale were all observed. The yield strength of the extruded alloy reached 217.06 MPa, and a yield plateau occurred under the tensile action. Through the observation and analysis of the tensile fracture, it was concluded that the fracture mechanism was a mixed type of fracture and the ignition point of the extruded alloy reached 894 ℃. The EBSD of the extruded state alloy is characterized by a fine crystalline microstructure containing a large amount of dynamic recrystallization. The appearance of the yield plateau may be related to the cyclic interaction between the solute atoms Ca in the matrix and the pinning-depinning of the dislocations. The high ignition point of the alloy is closely related to the dense and highly oxidation-resistant film formed by Ca and rare earth elements, and the present alloy has the advantages of low elemental content and high ignition point as compared with the other flame-retardant alloys.

导出引用

董飞虎, 王胜, 楚志兵, 程丽任, 车朝杰, 王子. 挤压态阻燃Mg-3Sm-1Gd-1Ca-0.5Zr合金微观组织和力学性能研究[J]. 精密成形工程. 2025, 17(11): 178-189 https://doi.org/10.3969/j.issn.1674-6457.2025.11.017

DONG Feihu, WANG Sheng, CHU Zhibing, CHENG Liren, CHE Chaojie, WANG Zi. Microstructure and Mechanical Properties of Extruded Flame Retardant Mg-3Sm-1Gd-1Ca-0.5Zr Alloy[J]. Journal of Netshape Forming Engineering. 2025, 17(11): 178-189 https://doi.org/10.3969/j.issn.1674-6457.2025.11.017

中图分类号： TG113.12

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