<strong>Mg-13Gd-1Zn</strong>合金的组织与力学性能

doi:10.11901/1005.3093.2019.364

材料研究学报

2020, Vol. 34

Issue (3): 225-230 DOI: 10.11901/1005.3093.2019.364

研究论文

本期目录 | 过刊浏览

Mg-13Gd-1Zn合金的组织与力学性能

甄睿^1,²(

),吴震¹,许恒源¹,谈淑咏^1,²

1. 南京工程学院材料科学与工程学院南京 211167
2. 江苏省先进结构材料与应用技术重点实验室南京 211167

Microstructures and Mechanical Properties of Mg-13Gd-1Zn Alloy

ZHEN Rui^1,²(

),WU Zhen¹,XU Hengyuan¹,TAN Shuyong^1,²

1. School of Material Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China
2. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, China

引用本文:

甄睿,吴震,许恒源,谈淑咏. Mg-13Gd-1Zn合金的组织与力学性能[J]. 材料研究学报, 2020, 34(3): 225-230.
Rui ZHEN, Zhen WU, Hengyuan XU, Shuyong TAN. Microstructures and Mechanical Properties of Mg-13Gd-1Zn Alloy[J]. Chinese Journal of Materials Research, 2020, 34(3): 225-230.

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摘要:

研究了铸态、退火态、挤压态和T5时效态Mg-13Gd-1Zn三元合金的显微组织和力学性能。结果表明，合金的铸态组织由α-Mg、(Mg,Zn)₃Gd和14H-LPSO长周期相组成。合金在均匀化退火和热挤压后的直接时效(T5)过程中都发生了晶内14H-LPSO相的沉淀析出，表明合金中14H-LPSO的沉淀相变发生在一个很宽的温度范围(200~510℃)。在挤压后合金的直接时效(T5)过程中发生了β'及β₁相的沉淀析出。在沉淀强化和LPSO强化的共同作用下，合金的屈服强度、抗拉强度和伸长率分别为197 MPa、397 MPa和2.56%。在200℃/80 MPa和200℃/120 MPa两种实验条件下，Mg-13Gd-1Zn合金的抗蠕变性能均优于WE54合金。

关键词 ：金属材料, 镁合金, 热挤压, 时效处理, 长周期结构, 蠕变

Abstract：

A ternary alloy with composition of Mg-13Gd-1Zn (%, mass fraction) was prepared by conventional smelting and casting technique. The microstructure and mechanical properties of the as-cast, as-annealed, as-extruded and as-aged (T5) alloy were investigated. The results show that the microstructure of the as-cast alloy consists of α-Mg matrix, (Mg, Zn)₃Gd eutectic and a 14H long period staking ordered (14H-LPSO) phase. The significant increase of 14H-LPSO phase after annealing and ageing (T5) treatment in the alloy microstructure indicates that the precipitation of the 14H-LPSO phase occurs in a wide temperature range (200~510^oC). The β' and β₁precipitates have also been observed in the alloy after ageing (T5) treatment. Under the combined action of precipitation strengthening and LPSO strengthening, the tensile strength, yield strength and elongation of the alloy are 397 MPa, 197 MPa and 2.56%, respectively. The creep properties of the Mg-13Gd-1Zn alloy are higher than those of the WE54 alloy in the two experimental conditions of 200^oC/80 MPa and 200^oC/120 MPa.

Key words： metallic materials magnesium alloy hot extrusion ageing treatment long period stacking ordered structures (LPSO) creep

收稿日期: 2019-07-22

ZTFLH:

TG146.22

基金资助:江苏省大学生创新创业训练计划(201911276034Y);南京工程学院科研基金(ZKJ201604);江苏高校优秀科技创新团队

作者简介: 甄睿，女，1978年生，副教授，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.364 或 https://www.cjmr.org/CN/Y2020/V34/I3/225

图1 铸态和退火态合金的XRD图谱

图2 合金的OM像和层片相的电子衍射花样(EB//[112?0])

图3 挤压态合金的显微组织

图4 T5态合金的显微组织

表1 Mg-13Gd-1Zn合金的室温拉伸性能

图5 合金T5处理后拉伸试样中14H-LPSO相的TEM照片和电子衍射花样(EB//[112?0])

图6 合金在200℃/80 MPa和200℃/120 MPa条件下蠕变100 h的蠕变曲线

表2 合金在200℃/80 MPa和200℃/120 MPa条件下的抗蠕变性能

图7 Mg-13Gd-1Zn合金在200℃/80 MPa条件下蠕变100 h的SEM形貌

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