Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第16卷    第11期    总第92期    2006年11月

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文章编号: 1004-0609(2006)11-1869-07
快速凝固Al-Fe-V-Si合金喷射沉积坯的显微组织与
力学性能
肖于德1, 2, 钟  掘2, 黎文献1, 马正青1

(1. 中南大学 材料科学与工程学院,长沙 410083;
2. 中南大学 机电工程学院, 长沙 410083
)

摘 要:  用喷射沉积法制备快凝Al-8.5Fe-1.3V-1.7Si合金沉积坯, 通过金相、 X射线衍射、 透射电镜、 扫描电镜、 拉伸力学性能测试等分析手段研究快凝Al-Fe-V-Si合金喷射沉积坯的显微组织与力学性能。 结果表明, 喷射沉积Al-Fe-V-Si合金坯是由形状大小不同的雾化液滴沉积凝固微区(粉末)构成, 也存在大量的孔隙和原始粉末界面。 沉积坯主要由α(Al)+Al12(Fe, V)3Si(bcc,a≈1.260 nm)的两相混合组织构成, 细小的Al12(Fe, V)3Si球形颗粒均匀分布在α(Al)基体上, 但不同粉末内部组织形态存在差异, 使沉积坯表现出组织微观不均匀性。 喷射沉积坯的力学性能与坯体致密度存在强烈的依赖关系, 大量孔隙和原始粉末界面的存在使得坯体强度和塑性都处于较低的水平。

 

关键字:  Al-Fe-V-Si合金; 耐热铝合金; 喷射沉积; 快速凝固

Microstructural features and mechanical properties of spray deposited billets of rapidly solidified Al-Fe-V-Si aluminum alloy
XIAO Yu-de1, 2, ZHONG Jue2, LI Wen-xian1, MA Zheng-qing1

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China

Abstract: Spray deposition was applied to produce deposited billets of rapidly solidified Al-8.7Fe-1.3V-1.8Si aluminum alloy in the atomization medium of nitrogen gas. Microstructural features and mechanical properties of the spray deposited billets were studied by means of optical microscopy (OM), X-ray diffraction (XRD), transmission electron microscopy (TEM) with energy dispersive X-ray (EDX) spectrometer and measurement of tensile properties. The results show that, the spray deposited billets of Al-Fe-V-Si alloy consist of platelets (powder particles) with various size and shape, deposited and solidified from the atomized liquid droplets, and a large amount of irregular porosity (or pinhole) and prior particle boundaries also exist in the as-solidified deposit. The spray deposited billets consist of two phases mixture of α(Al) and Al12(Fe, V)3Si (bcc, a≈1.260 nm), which is characterized generally as the fine Al12(Fe, V)3Si particles dispersed uniformly in the α(Al) matrix. However, the various powder particles have different microstructural morphologies and thus the spray deposited billets exhibit structural inhomogeneity on the micro scale. The mechanical properties of the spray deposited materials are mightily dependent on relative compacted density of the billets, and the large amount of irregular porosity (or pinhole) and prior particle boundaries result in that the tensile strength and elongation of the billets are at the low level.

 

Key words: Al-Fe-V-Si alloy; heat-resistant aluminum alloy; spray deposition; rapid solidification

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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