LPSO相增强Mg-6Gd-4Y-<i>x</i>Zn合金的组织与力学性能

doi:10.11901/1005.3093.2017.493

材料研究学报

2018, Vol. 32

Issue (6): 439-448 DOI: 10.11901/1005.3093.2017.493

研究论文

本期目录 | 过刊浏览

LPSO相增强Mg-6Gd-4Y-xZn合金的组织与力学性能

甄睿^1,²(

), 孙扬善³, 沈学为¹, 巴志新^1,²

1 南京工程学院材料工程学院南京 211167
2 江苏省先进结构材料与应用技术重点实验室南京 211167
3 东南大学材料科学与工程学院江苏省先进金属材料高技术研究重点实验室南京 211189

Microstructures and Mechanical Properties of Mg-6Gd-4Y-xZn Alloys Reinforced with LPSO Phases

Rui ZHEN^1,²(

), Yangshan SUN³, Xuewei SHEN¹, Zhixin BA^1,²

1 School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China
2 Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, China
3 Jiangsu Key Lab of Advanced Metallic Materials, College of Material Science & Engineering, Southeast University, Nanjing 211189, China;

引用本文:

甄睿, 孙扬善, 沈学为, 巴志新. LPSO相增强Mg-6Gd-4Y-xZn合金的组织与力学性能[J]. 材料研究学报, 2018, 32(6): 439-448.
Rui ZHEN, Yangshan SUN, Xuewei SHEN, Zhixin BA. Microstructures and Mechanical Properties of Mg-6Gd-4Y-xZn Alloys Reinforced with LPSO Phases[J]. Chinese Journal of Materials Research, 2018, 32(6): 439-448.

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摘要:

制备了3种LPSO相增强Mg-6Gd-4Y-xZn (x=1,2,3)(%,质量分数,下同)四元镁合金,研究了不同Zn含量对合金显微组织和室温力学性能的影响,并探讨了合金中LPSO相的形成与演变过程及其对合金的强化机制。研究结果表明,Mg-6Gd-4Y-3Zn合金的铸态组织主要由α-Mg和18R长周期结构相Mg₁₂Y₁Zn₁相组成。若降低合金中的Zn含量,显微组织中会出现Mg₂₄(GdYZn)₅。3种合金的退火组织均由α-Mg、18R-LPSO和14H-LPSO相组成,且随着Zn含量的增加,合金中18R-LPSO相的体积分数增加且基体中14H-LPSO相的层片变粗。挤压态合金在T6和T5处理的过程中均发生了β' 沉淀。随着Zn含量增加,合金Mg-6Gd-4Y-xZn(包括挤压态和时效态)在常温下的抗拉强度降低。显微组织中18R-LPSO相、细小弥散分布的14H-LPSO相和β'沉淀相共存方能实现理想的强化效果。

关键词 ：金属材料, 镁合金, 热挤压, 时效处理, 长周期结构, 强化机理

Abstract：

Three quaternary Mg-alloys of Mg-6Gd-4Y-xZn (x=1, 2, 3, mass fraction, %) were prepared, while all the alloys contained strengthened phases of long period stacking ordered (LPSO) structure. The effect of Zn-concentration on the microstructure and mechanical property of the alloys, as well as the formation and evolution of LPSO phases in the alloys and their strengthening mechanism were also studied. Results show that the as-cast microstructure of the Mg-6Gd-4Y-3Zn alloy consists of α-Mg matrix and Mg₁₂Y₁Zn₁phase which presents 18R long period staking ordered (18R-LPSO) structure. The Mg₂₄(GdYZn)₅ eutectic was observed in the as cast microstructure of the alloys with lower Zn additions. After homogenizing annealing, the microstructure of all the quaternary alloys consists of a-Mg matrix, 18R-LPSO- and 14H-LPSO-phases. With the increase of Zn content, the volume fraction of 18R-LPSO phase increases and the lamellae of the 14H-LPSO phase in the matrix are thickened. Both T6- and T5-treatments result in the β' precipitation. The tensile strength of Mg-6Gd-4Y-xZn alloys decreases with the increase of Zn content. The ideal strengthening effect can be achieved by the coexistence of 18R-LPSO phase, small and well distributed precipitates of 14H-LPSO phase and β' precipitates in the microstructure.

Key words： metallic materials magnesium alloy hot extrusion aging treatment long period stacking ordered structures (LPSO) strengthening mechanism

收稿日期: 2017-08-18

ZTFLH:

TG146.22

基金资助:江苏省优秀青年基金(BK20160081),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:

作者简介甄睿,女,1978年生,副教授,博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.493 或 https://www.cjmr.org/CN/Y2018/V32/I6/439

表1 合金的化学成分

图1 铸态GWZ641、GWZ642和GWZ643合金的XRD图谱

图2 GWZ642合金的铸态显微组织

图3 GWZ641铸态合金中Mg12Y1Zn1 相的TEM像和电子衍射花样

图4 退火态GWZ641、GWZ642和GWZ643合金的OM像

图5 GWZ641退火态合金中层片相的TEM像和电子衍射花样(EB//[112?0])

图6 GWZ642合金挤压态的显微组织

图7 T4态GWZ642合金的OM像

图8 GWZ641(a)、GWZ642(b)和GWZ643(c)合金在不同温度下T6处理的时效硬化曲线

图9 GWZ641 与GWZ642 合金T6态组织的OM和TEM像

图10 GWZ641 与GWZ643 合金T5 态组织的OM和TEM像 2.4 力学性能

表2 不同处理状态合金的室温力学性能

图11 GWZ641合金挤压态拉伸试样中18R-LPSO相与14H-LPSO相的TEM照片

图12 挤压态合金GWZ641中14H-LPSO相的TEM照片

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