<strong>Zr</strong>含量对铸造<strong>AlSi7Mg0.4</strong>合金力学性能的影响

doi:10.11901/1005.3093.2020.228

材料研究学报

2021, Vol. 35

Issue (3): 209-220 DOI: 10.11901/1005.3093.2020.228

研究论文

本期目录 | 过刊浏览

Zr含量对铸造AlSi7Mg0.4合金力学性能的影响

张云翔¹, 赵海东¹(

), 朱霖², 李昌海², 武汉琦²

^1.华南理工大学国家金属材料近净成形工程技术研究中心广州 510640
^2.中信戴卡股份有限公司秦皇岛 066011

Effect of Zr Contents on Mechanical Properties of Cast AlSi7Mg0.4 Alloys

ZHANG Yunxiang¹, ZHAO Haidong¹(

), ZHU Lin², LI Changhai², WU Hanqi²

^1.National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China
^2.CITIC Dicastal Co. Ltd. , Qinhuangdao 066011, China

引用本文:

张云翔, 赵海东, 朱霖, 李昌海, 武汉琦. Zr含量对铸造AlSi7Mg0.4合金力学性能的影响[J]. 材料研究学报, 2021, 35(3): 209-220.
Yunxiang ZHANG, Haidong ZHAO, Lin ZHU, Changhai LI, Hanqi WU. Effect of Zr Contents on Mechanical Properties of Cast AlSi7Mg0.4 Alloys[J]. Chinese Journal of Materials Research, 2021, 35(3): 209-220.

全文: PDF(17417 KB) HTML

摘要:

研究了添加Zr元素的重力铸造AlSi7Mg0.4合金的微观组织和力学性能。结果表明，在含Zr的铸态合金中生成了(Al，Si)₃(Zr，Ti)和π-Fe相，Zr的添加使合金的晶粒尺寸减小；经过T6热处理后富Fe相中的Mg和少量粗大的(Al，Si)₃(Zr，Ti)相重溶到基体中，减小了金属间化合物的尺寸，生成了与基体有共格关系的含Zr析出相。含Zr合金的抗拉强度和伸长率达到332 MPa和8.7%，比不含Zr的合金分别提高了10%和90%。

关键词 ：金属材料, AlSi7Mg0.4合金, 微观组织, 力学性能, Zr含量, (Al，Si)₃(Zr，Ti)

Abstract：

Ingots of AlSi7Mg0.4 alloys with 0.06%, 0.14% and 0.20% Zr addition respectively were fabricated with gravity casting method. The microstructure analysis of the as-cast alloys shows that (Al, Si)₃(Zr, Ti) and π-Fe phases formed in these alloys. Compared with the AlSi7Mg0.4 alloys without Zr, the grain size of the alloys containing Zr is smaller. Strengthening phase (Al, Si)₃(Zr, Ti) precipitated in the alloys containing Zr during the solution treatment. After T6 heat treatment, a small amount of Mg in the Fe-rich intermetallics and a little part of coarse (Al, Si)₃(Zr, Ti) phases re-dissolved into the matrix, which decreased the intermetallics sizes. The tensile strength and elongation of the alloys containing Zr are 332 MPa and 8.7%, which are 10% and 90% higher than the alloy without Zr, respectively.

Key words： metallic materials AlSi7Mg0.4 alloy microstructure mechanical properties Zr contents (Al, Si)₃(Zr, Ti)

收稿日期: 2020-06-11

ZTFLH:

TG166.3

基金资助:广东省重点领域研发计划(2020B010186002)

作者简介: 张云翔，男，1996年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.228 或 https://www.cjmr.org/CN/Y2021/V35/I3/209

图1 铸件和拉伸试样的尺寸

表1 实验合金的化学成分

图2 4种合金的时效硬化曲线

图3 铸态合金的微观组织

表2 Zr含量对晶粒尺寸和SDAS的影响

图4 Al-Zr二元合金的相图

图5 铸态合金的SEM显微组织

表3 铸态合金中金属间化合物的EDS结果和面积分数

图6 合金的面扫描分布图

图7 T6热处理合金的SEM显微组织

表4 T6热处理态合金中金属化合物的EDS结果和面积分数

图8 T6热处理合金的明场TEM组织

表5 T6热处理合金中β″析出相的平均长度、横截面积和数密度

图9 合金3中Al-Si-Zr-Ti析出相的亮场TEM图像和沿[010]Al轴对应的SADP

图10 合金4中Al-Si-Zr-Ti析出相的TEM照片、[001]Al轴上Al-Si-Zr-Ti相的快速傅里叶变换(FFT)图以及Al-Si-Zr-Ti析出相的TEM-EDS分析结果

表6 T6热处理合金中Al-Si-Zr-Ti析出相的平均长度、长宽比和数密度

图11 高分辨透射电镜图：Al-Si-Zr-Ti沉淀相与α-Al基体(a)半共格和(c)共格界面，(b)和(d)相对应的IFFT图

表7 不同Zr含量铸态和T6热态合金的力学性能

图12 合金2的铸态(a)、T6热处理态(b)的拉伸断口形貌和SEM-EDS分析结果(c，d)以及合金4的铸态(e)、T6热处理态(f)的的拉伸断口形貌和SEM-EDS分析结果(g，h)

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