<strong>Y</strong>对<strong>Mg-14Al-5Si</strong>合金性能的影响

doi:10.11901/1005.3093.2021.112

材料研究学报

2022, Vol. 36

Issue (3): 213-219 DOI: 10.11901/1005.3093.2021.112

研究论文

本期目录 | 过刊浏览

Y对Mg-14Al-5Si合金性能的影响

范晋平(

), 蒋一锋, 裴镖, 康文旭

太原理工大学材料科学与工程学院太原 030024

Effect of Y on Properties of Mg-14Al-5Si Alloy

FAN Jinping(

), JIANG Yifeng, PEI Biao, KANG Wenxu

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

引用本文:

范晋平, 蒋一锋, 裴镖, 康文旭. Y对Mg-14Al-5Si合金性能的影响[J]. 材料研究学报, 2022, 36(3): 213-219.
Jinping FAN, Yifeng JIANG, Biao PEI, Wenxu KANG. Effect of Y on Properties of Mg-14Al-5Si Alloy[J]. Chinese Journal of Materials Research, 2022, 36(3): 213-219.

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摘要:

使用扫描电子显微镜(SEM)、能量色散光谱仪(EDS)、光学显微镜(OM)及X射线衍射仪(XRD)等手段分析了Mg-14Al-5Si合金的组织和成分，用布洛维硬度计和电子万能试验机测试了这种合金的力学性能，研究了在Mg-14Al-5Si合金中添加不同量的Y元素对其组织和力学性能的影响。结果表明：在Mg-14Al-5Si合金中分别添加0.5%、0.8%、1.0%和1.5%(质量分数，下同)的Y元素，使合金中的Mg₂Si相由粗大的树枝状变为多边形和圆形，共晶β-Mg₁₇Al₁₂相由粗大的连续网格状变为细小的网格状和孤岛状。Y的添加量为1.0%时改性效果最佳，Mg₂Si相的平均尺寸由42.21 µm减小到8.15 µm，此时合金的力学性能最佳，硬度为135 HB，抗拉强度为147 MPa，屈服强度为76 MPa,伸长率为5.04％。在Y的添加量为1.5%的合金中发现白色块状的Mg-Si-Y化合物。Y元素能促进Mg₂Si相形核、抑制其各向异性生长，并在β-Mg₁₇Al₁₂相的生长前沿偏析形成过冷结构，抑制其生长。

关键词 ：金属材料, Mg-14Al-5Si, Y, 微观组织, 力学性能

Abstract：

The effect of Y addition on the microstructure and mechanical properties of Mg-14Al-5Si alloy was investigated by means of scanning electron microscope (SEM), energy dispersive spectrometer (EDS), optical microscope (OM) and X-ray diffractometer (XRD), as well as Bloch hardness tester and electronic universal testing machine. The results show that the addition of 0.5%, 0.8%, 1.0% and 1.5% (mass fraction) Y can induce obvious changes of phases in the Mg-14Al-5Si alloy, namely, the silicide phase Mg₂Si changes from coarse dendrite to polygon and round shape, and the eutectic phase β-Mg₁₇Al₁₂changes from coarse continuous grid to fine grid and islets like. The alloying effect for the Y addition amount of 1.0% is the best i.e., the average size of Mg₂Si reduced from 42.21 μm to 8.15 μm, the mechanical properties of the alloy also reach the best with hardness of 135HB, tensile strength of 147 MPa, yield strength of 76 MPa and elongation of 5.04% respectively. White block Mg-Si-Y compound is found in the alloy with Y1.5%. The element Y can promote the nucleation of Mg₂Si and inhibit the anisotropic growth of Mg₂Si. At the same time, Y segregates in the front of the growth of β-Mg₁₇Al₁₂ phase, forming a supercooled structure and inhibiting its growth.

Key words： metallic materials Mg-14Al-5Si Y microstructure mechanical property

收稿日期: 2021-01-24

ZTFLH:

TG430.4020

基金资助:太原理工大学技术开发项目(RH19200007)

作者简介: 范晋平，女，1974年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.112 或 https://www.cjmr.org/CN/Y2022/V36/I3/213

表1 Y变质Mg-14Al-5Si合金的化学成分

图1 Mg-14Al -5Si合金的XRD谱

图2 Mg-14Al-5Si合金的光学显微照片

图3 1.5%Y变质Mg-14Al-5Si合金的XRD谱

图4 Y添加量不同的Mg-14Al-5Si合金的光学显微照片

图5 Y添加量不同的合金中Mg2Si相颗粒的平均尺寸

图6 1.5%Y变质合金的SEM照片和A处白色块状相的EDS分析

图7 Y添加量不同的Mg-14Al -5Si合金的硬度

图8 Y添加量不同的Mg-14Al-5Si合金的拉伸曲线

表2 Y添加量不同的Mg-14Al -5Si合金的抗拉强度(σb)、屈服强度(σ0.2)和伸长率(δ)

图9 Y添加量不同的Mg-14Al-5Si合金拉伸断口的SEM照片

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