Effects of Zr, Ti and Sc additions on the microstructure and mechanical properties of Al-0.4Cu-0.14Si-0.05Mg-0.2Fe alloys

doi:10.1016/j.jmst.2018.05.011

材料科学与技术 ›› 2018, Vol. 34 ›› Issue (12): 2316-2324.DOI: 10.1016/j.jmst.2018.05.011

收稿日期:2018-01-19 修回日期:2018-04-06 接受日期:2018-04-25 出版日期:2018-12-20 发布日期:2018-11-15

Effects of Zr, Ti and Sc additions on the microstructure and mechanical properties of Al-0.4Cu-0.14Si-0.05Mg-0.2Fe alloys

Jian Feng^a, Bing Ye^a^*(), Lijie Zuo^a, Ruijuan Qi^b^*(), Qudong Wang^a, Haiyan Jiang^a, Rong Huang^b, Wenjiang Ding^a, Jie Yao^c, Chuntao Wang^c

a National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
b Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai, 200062, China
c Ningbo Heli Mould Technology Co., Ltd, 358 Xigu Road, Industrial Park, Xiangshan County, Zhejiang, 315700, China

Received:2018-01-19 Revised:2018-04-06 Accepted:2018-04-25 Online:2018-12-20 Published:2018-11-15
Contact: Ye Bing,Qi Ruijuan

摘要/Abstract

Abstract:

The evolution of microstructure and mechanical properties of Al-0.4Cu-0.14Si-0.05Mg-0.2Fe (wt.%) alloys, micro-alloyed with Zr, Ti and Sc, were investigated. The addition of 0.2%Zr to base alloy accelerates the precipitation of Si-rich nano-phase in α-Al matrix, which plays an important role in improving the mechanical properties of an alloy. The tensile strength increases from 102 MPa for the base alloy to 113 MPa for the Zr-modified alloy. Adding 0.2%Zr + 0.2%Ti to base alloy effectively refines α-Al grain size and accelerates the precipitation of Si and Cu elements, leading to heavy segregation at grain boundary. By further adding 0.2%Sc to Zr + Ti modified alloy, the segregation of Si and Cu elements is suppressed and more Si and Cu precipitates appeared in α-Al matrix. Accompanied with the formation of coherent Al₃Sc phase, the tensile strength increases from 108 MPa for the Zr + Ti modified alloy to 152 MPa for the Sc-modified alloy. Due to excellent thermal stability of Al₃Sc phase, the Sc-modified alloy exhibits obvious precipitation hardening behavior at 350 °C, and the tensile strength increases to 203 MPa after holding at 350 °C for 200 h.

Key words: Micro-alloying, Microstructure, Mechanical properties, Al₃Sc, Grain size

. [J]. 材料科学与技术, 2018, 34(12): 2316-2324.

Jian Feng, Bing Ye, Lijie Zuo, Ruijuan Qi, Qudong Wang, Haiyan Jiang, Rong Huang, Wenjiang Ding, Jie Yao, Chuntao Wang. Effects of Zr, Ti and Sc additions on the microstructure and mechanical properties of Al-0.4Cu-0.14Si-0.05Mg-0.2Fe alloys[J]. J. Mater. Sci. Technol., 2018, 34(12): 2316-2324.

图/表 12

Table 1 Chemical composition of the studied alloys (wt.%).

Alloys	Cu	Si	Mg	Zr	Ti	Sc	Fe	Al
Base	0.41	0.13	0.02				0.18	Bal.
Base + Zr (BZ)	0.39	0.12	0.02	0.18			0.19	Bal.
Base + ZrTi (BZT)	0.38	0.13	0.03	0.18	0.19		0.17	Bal.
Base + ZrTiSc (BZTS)	0.41	0.13	0.02	0.17	0.17	0.17	0.18	Bal.

Fig. 1. Microstructure of as-cast alloys: (a) base alloy, (b) 0.2%Zr, (c) 0.2%Zr + 0.2%Ti, (d) 0.2%Zr + 0.2%Ti + 0.2%Sc.

Fig. 2. SEM images and the EDS analysis for Al-0.4Cu-0.14Si-0.05Mg-0.2Fe alloy.

Fig. 3. SEM images and the EDS analysis for the base alloy modified with: (a, b) 0.2%Zr, (c, d) 0.2%Zr + 0.2%Ti.

Table 2 EDS results for the corresponding points in Fig. 3 (at.%).

Point	Al	Fe	Si	Cu	Mg	Ti	Zr
1	67.0	1.1	20	3.7	6.1	-	2.1
2	77.6	7.9	12.9	2.6	-	-	-
3	87.8	4.4	7.0	0.8	-	-	-
4	86.1	3.2	4.4	6.3	-	-	-
5	88.6	6.4	3.6	1.4	-	-	-
6	88.9	5.9	3.8	1.5	-	-	-
7	89.6	-	-	0.6	2.8	7.0	-
8	99.5	-	-	0.3	-	0.2	0.1

Fig. 4. SEM images and EDS mapping for base alloy modified with 0.2%Zr + 0.2%Ti + 0.2%Sc.

Table 3 EDS results for the corresponding points in Fig. 4 (at.%).

Point	Al	Fe	Si	Cu	Sc
9	88.6	-	-	0.6	10.8
10	85.6	7.1	4.8	2.2	0.3
11	75.1	0.2	4.2	19.8	0.7
12	87.5	6.3	3.6	2.0	0.7
13	91.5	3.9	2.9	1.5	0.3
14	89.9	5.0	3.4	1.7	0.1
15	98.2	0.7	-	1.0	0.1

Fig. 5. TEM images for the base alloy: (a) bright field image, (b) SAED pattern of [011]Al, (c) HRTEM image along the projection of [011]Al, (d) STEM image along [011]Al and EDS results of the corresponding area.

Fig. 6. TEM images and EDS analysis for the base alloy modified with: (a, b) 0.2%Zr, (c, d) 0.2%Zr + 0.2%Ti.

Fig. 7. TEM images for the base alloy modified with 0.2%Zr + 0.2%Ti + 0.2%Sc: (a) bright field image, (b, c) HRTEM image along the projection of [011]Al, (d) STEM bright field image along [011]Al and EDS results of the corresponding area.

Fig. 8. XRD patterns for the studied alloys.

Fig. 9. Mechanical properties evolution for the studied alloys: (a) microhardness evolution at 350 °C for 200 h, (b) tensile curves in as-cast state, (c) after holding at 350 °C for 200 h.

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Effects of Zr, Ti and Sc additions on the microstructure and mechanical properties of Al-0.4Cu-0.14Si-0.05Mg-0.2Fe alloys

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