Effect of extrusion parameter on microstructure and mechanical properties of Mg-6Zn-1Mn-0.2Gd alloy

IF 1.3 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Emerging Materials Research Pub Date : 2023-09-01 DOI:10.1680/jemmr.22.00191

Yang Zhao, Hang Li, X. Wei, Fangchao Zhao, Dingfei Zhang

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引用次数: 1

Abstract

Microstructure, dynamic recrystallization (DRX) behavior and texture evolution of as-extruded Mg-6Zn-1Mn-0.2Gd (ZMG610) alloy at different extrusion condition (extrusion ratio of 25 and 45, temperature of 350 °C and 400 °C) were investigated. As-cast ZMG610 alloy was mainly comprised of α-Mg matrix, Mg7Zn3 phase and Mg3Zn6Gd (I-phase), large number of I-phase particles remained in the matrix after homogenization treatment at 330 °C up to 24 h. As-extruded ZMG610 alloy exhibited a bimodal structure consisting of fine dynamically recrystallized grains with wide orientation spread and coarse un-dynamically recrystallized grains with strong basal texture. All as-extruded samples exhibited typical basal texture with basal plane of most grains paralleled to extrusion direction (ED). The lower texture intensity could be obtained through the increase of both extrusion ratio and temperature. Optimal mechanical properties (YS of 267 MPa, UTS of 360 MPa and EL of 14.2%) were obtained through the combination of low temperature (350 °C) and high extrusion ratio (45). Amelioration of mechanical properties highly depended on the synergistic effect of dynamically recrystallized grains, I-phase particles and texture.

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挤压参数对Mg-6Zn-1Mn-0.2Gd合金组织和力学性能的影响

研究了Mg-6Zn-1Mn-0.2Gd（ZMG610）合金在不同挤压条件（挤压比为25和45，温度为350°C和400°C）下的组织、动态再结晶（DRX）行为和织构演变。铸态ZMG610合金主要由α-Mg基体、Mg7Zn3相和Mg3Zn6Gd（I相）组成，在330°C至24°C的均匀化处理后，基体中残留了大量的I相颗粒 h.挤压态ZMG610合金表现出双峰结构，由具有宽取向扩展的精细动态再结晶晶粒和具有强基底织构的粗糙非动态再结晶颗粒组成。所有的挤压样品都表现出典型的基底织构，大多数晶粒的基面平行于挤压方向（ED）。通过提高挤压比和温度可以获得较低的织构强度。最佳机械性能（YS of 267 MPa，UTS为360 MPa和14.2%的EL）。力学性能的改善在很大程度上取决于动态再结晶晶粒、I相颗粒和织构的协同作用。

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来源期刊

Emerging Materials Research MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.50

自引率

9.10%

发文量

期刊介绍： Materials Research is constantly evolving and correlations between process, structure, properties and performance which are application specific require expert understanding at the macro-, micro- and nano-scale. The ability to intelligently manipulate material properties and tailor them for desired applications is of constant interest and challenge within universities, national labs and industry.