热压烧结温度对<strong>SiC/Al-Zn-Mg-Cu</strong>复合材料微观结构与力学性能的影响

doi:10.11900/0412.1961.2018.00523

金属学报

2019, Vol. 55

Issue (10): 1319-1328 DOI: 10.11900/0412.1961.2018.00523

本期目录 | 过刊浏览

热压烧结温度对SiC/Al-Zn-Mg-Cu复合材料微观结构与力学性能的影响

马国楠^1,²,王东¹(

),刘振宇¹,毕胜^1,²,昝宇宁^1,²,肖伯律¹,马宗义¹

1. 中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
2. 中国科学技术大学材料科学与工程学院沈阳 110016

Effect of Hot Pressing Temperature on Microstructure and Tensile Properties of SiC/Al-Zn-Mg-Cu Composites

MA Guonan^1,²,WANG Dong¹(

),LIU Zhenyu¹,BI Sheng^1,²,ZAN Yuning^1,²,XIAO Bolv¹,MA Zongyi¹

1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

马国楠, 王东, 刘振宇, 毕胜, 昝宇宁, 肖伯律, 马宗义. 热压烧结温度对SiC/Al-Zn-Mg-Cu复合材料微观结构与力学性能的影响[J]. 金属学报, 2019, 55(10): 1319-1328.
Guonan MA, Dong WANG, Zhenyu LIU, Sheng BI, Yuning ZAN, Bolv XIAO, Zongyi MA. Effect of Hot Pressing Temperature on Microstructure and Tensile Properties of SiC/Al-Zn-Mg-Cu Composites[J]. Acta Metall Sin, 2019, 55(10): 1319-1328.

全文: PDF(20713 KB) HTML

摘要:

利用粉末冶金法制备了含15%SiC (体积分数)的SiC/Al-7.5Zn-2.8Mg-1.7Cu (质量分数，%)复合材料，采用TEM、EPMA和拉伸实验等分析测试手段，研究了热压烧结温度(500~560 ℃)对复合材料微观组织和力学性能的影响。结果表明，所选热压温度下均可制备致密无孔洞的复合材料坯锭。热压温度为500和520 ℃时，SiC/Al界面反应程度较轻，挤压棒材经T6热处理后，Zn元素均匀分布于基体中，但存在的少量富Mg微米级难溶相使复合材料的力学性能产生较大波动。当热压温度升高到540 ℃时，富Mg难溶相尺寸明显减小，元素分布变得更均匀，复合材料力学性能稳定性明显提升。当热压温度继续升高到560 ℃时，Mg元素开始向SiC颗粒周围偏聚，界面反应更加严重，而且降低了基体中MgZn₂的体积分数，使复合材料抗拉强度明显下降。对560 ℃热压的复合材料进行高角度环形暗场像和EDS分析，发现SiC/Al界面同时存在含Mg氧化物和粗大的MgZn₂沉淀相。

关键词 ：粉末冶金, 金属基复合材料, 界面, 析出相

Abstract：

Particulate reinforced aluminum matrix composites have been widely used in industrial fields. In general, high strength aluminium alloys, such as 2024Al are employed to produce stronger composites. However, the composites with high strength Al-Zn-Mg-Cu alloys as the matrices are paid relative attentions. Therefore, the corresponding optimization for fabrication parameters has not been well understood. In the present work, SiC particles with volume fraction of 15% reinforced Al-7.5Zn-2.8Mg-1.7Cu (mass fraction, %) composites were fabricated using powder metallurgy (PM) technique at hot pressing temperatures of 500, 520, 540 and 560 ℃. TEM, EPMA and tensile test were used to study the effect of hot pressing temperature on the microstructure and tensile properties of SiC/Al-Zn-Mg-Cu composites. The measured densities indicated that all the composites were completely condensed, no pores were observed. Undissolved phase containing Mg and Cu segregated in matrix of the composites hot pressed at 500 and 520 ℃, resulting in instable tensile properties. With increasing hot pressing temperature to 540 ℃, Mg and Cu were uniformly distributed in the composites which exhibited the stable tensile properties. With further increasing temperature to 560 ℃, Mg segregated around SiC particles due to interface reaction. In this case, the content of MgZn₂ phase was decreased, resulting in the reduction of tensile strength. HAADF-STEM and EDS analyses showed that the interface compounds were oxide of Mg and coarse MgZn₂ phase.

Key words： powder metallurgy metal matrix composite interface precipitate

收稿日期: 2018-11-20

ZTFLH:

TG146.2

基金资助:国家重点研发计划项目(52017YFB0703104);国家自然科学基金项目(51771193);国家自然科学基金项目(U1508216)

作者简介: 马国楠，男，1992年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00523 或 https://www.ams.org.cn/CN/Y2019/V55/I10/1319

表1 不同热压温度制备热压态SiC/Al-7.5Zn-2.8Mg-1.7Cu复合材料的测量密度和致密度

图1 不同热压温度制备的SiC/Al-7.5Zn-2.8Mg-1.7Cu复合材料挤压棒材显微组织的OM像

图2 SiC颗粒分布的均匀性

图3 不同热压温度制备的SiC/Al-7.5Zn-2.8Mg-1.7Cu复合材料的XRD谱

图4 500 ℃热压烧结T6态SiC/Al-7.5Zn-2.8Mg-1.7Cu复合材料的SE-SEM像和元素分布图

图5 不同热压温度制备T6态SiC/Al-7.5Zn-2.8Mg-1.7Cu复合材料的SE-SEM像和元素分布图

图6 不同热压温度制备T6态SiC/Al-7.5Zn-2.8Mg-1.7Cu复合材料的界面TEM像和HAADF-STEM像

图7 560 ℃下热压的T6态SiC/Al-7.5Zn-2.8Mg-1.7Cu复合材料界面产物的TEM像和元素分布图

Hot pressing temperature ℃	Tensile strength MPa	Yield strength MPa	Elongation %
500	679 $±$ 13	645 $±$ 19	2.8 $±$ 0.6
520	675 $±$ 8	637 $±$ 10	3.0 $±$ 0.4
540	671 $±$ 6	632 $±$ 6	3.2 $±$ 0.6
560	658 $±$ 10	620 $±$ 10	3.4 $±$ 0.4

表2 不同热压温度制备T6态SiC/Al-7.5Zn-2.8Mg-1.7Cu复合材料的拉伸性能

图8 不同热压温度制备T6态SiC/Al-7.5Zn-2.8Mg-1.7Cu复合材料试样断口形貌的SEM像

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