挤压对TiC纳米颗粒增强低合金化Mg–2Zn–0.8Sr–0.2Ca基复合材料显微组织和力学性能的影响

王泽东; 聂凯波; 邓坤坤; 韩俊刚

doi:10.1007/s12613-021-2353-8

Volume 29 Issue 11

Nov. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(11): 1981-1990

Zedong Wang, Kaibo Nie, Kunkun Deng, and Jungang Han, Effect of extrusion on the microstructure and mechanical properties of a low-alloyed Mg–2Zn–0.8Sr–0.2Ca matrix composite reinforced by TiC nano-particles, Int. J. Miner. Metall. Mater., 29(2022), No. 11, pp. 1981-1990. https://doi.org/10.1007/s12613-021-2353-8

Cite this article as:

Zedong Wang, Kaibo Nie, Kunkun Deng, and Jungang Han, Effect of extrusion on the microstructure and mechanical properties of a low-alloyed Mg–2Zn–0.8Sr–0.2Ca matrix composite reinforced by TiC nano-particles, Int. J. Miner. Metall. Mater., 29(2022), No. 11, pp. 1981-1990. https://doi.org/10.1007/s12613-021-2353-8

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研究论文

挤压对TiC纳米颗粒增强低合金化Mg–2Zn–0.8Sr–0.2Ca基复合材料显微组织和力学性能的影响

1)
太原理工大学材料科学与工程学院，太原 030024, 中国
2)
太原理工大学，山西省先进镁基材料重点实验室，太原 030024, 中国

通讯作者:
聂凯波 E-mail: kaibo.nie@gmail.com

文章亮点

(1) 成功制备了高强TiC增强Mg–2Zn–0.8Sr–0.2Ca复合材料。

(2) 系统地研究了挤压参数对TiC增强Mg–2Zn–0.8Sr–0.2Ca复合材料显微组织的影响规律。

(3) 阐明了TiC增强Mg–2Zn–0.8Sr–0.2Ca复合材料的强化机理以及断裂机制。

中文摘要

镁合金作为轻金属材料的代表，在电子、交通和航空航天等领域有着广阔的应用前景。然而镁合金仍存在强度低、延展性差和耐蚀性差等缺点，改善镁合金的强塑性已成为拓宽镁合金在工业应用的中的首要问题。本文利用超声辅助半固态搅拌法成功制备了TiC纳米颗粒增强低合金化Mg–2Zn–0.8Sr–0.2Ca基复合材料，并且对铸态复合材料进行热挤压变形，系统研究了挤压对其显微组织及力学性能的影响。结果表明，在较低的挤压温度或挤压速率下，复合材料动态再结晶的体积分数和再结晶晶粒尺寸有所降低。挤压条件为200°C， 0.1 mm/s时，复合材料中出现了晶粒尺寸约0.3 µm的细晶组织。挤压后的复合材料呈现强基面织构，当挤压温度从200℃增加到240℃时，基面织构强度随之增加。挤压条件为200°C，0.1 mm/s时复合材料的抗拉强度达480.2 MPa，屈服强度为462 MPa。对其强化机制进行理论计算表明相比与其他强化机制，细晶强化对强度的贡献最大。通过分析三种挤压后的纳米复合材料断裂行为，表明其断裂方式为韧脆混合型断裂。

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Research Article

Effect of extrusion on the microstructure and mechanical properties of a low-alloyed Mg–2Zn–0.8Sr–0.2Ca matrix composite reinforced by TiC nano-particles

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Abstract

Abstract

A low-alloyed Mg–2Zn–0.8Sr–0.2Ca matrix composite reinforced by TiC nano-particles was successfully prepared by semi-solid stirring under the assistance of ultrasonic, and then the as-cast composite was hot extruded. The results indicated that the volume fraction of dynamical recrystallization and the recrystallized grain size have a certain decline at lower extrusion temperature or rate. The finest grain size of ~0.30 µm is obtained in the sample extruded at 200°C and 0.1 mm/s. The as-extruded sample displays a strong basal texture intensity, and the basal texture intensity increases to 5.937 mud while the extrusion temperature increases from 200 to 240°C. The ultra-high mechanical properties (ultimate tensile strength of 480.2 MPa, yield strength of 462 MPa) are obtained after extrusion at 200°C with a rate of 0.1 mm/s. Among all strengthening mechanisms for the present composite, the grain refinement contributes the most to the increase in strength. A mixture of cleavage facets and dimples were observed in the fracture surfaces of three as-extruded nanocomposites, which explain a mix of brittle-ductile fracture way of the samples.
- magnesium matrix composite;
- extrusion;
- microstructure and mechanical properties;
- texture;
- fracture

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