Effect of minor Sc and Zr on recrystallization behavior and mechanical properties of novel Al-Zn-Mg-Cu alloys

被引：143

作者：

Liu, Jing ^{[1
,2
]}

Yao, Pei ^{[1
,2
,3
]}

Zhao, Naiqin ^{[2
]}

Shi, Chunsheng ^{[2
]}

Li, Huijun ^{[3
]}

Li, Xuan ^{[1
]}

Xi, Desheng ^{[1
,2
]}

Yang, Shuo ^{[1
,2
]}

机构：

[1] Tianjin Univ, Sch Mat Sci & Engn, Ctr Anal & Tests, Tianjin 300072, Peoples R China

[2] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China

[3] Univ Wollongong, Fac Engn, Wollongong, NSW 2522, Australia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 657卷

关键词：

Al-Zn-Mg-Cu-Sc-Zr alloys; Recrystallization; Mechanical properties; Precipitation; MICROALLOYING ADDITIONS; TENSILE PROPERTIES; POWDER-METALLURGY; ALUMINUM-ALLOY; MICROSTRUCTURE; PRECIPITATION; EVOLUTION;

D O I：

10.1016/j.jallcom.2015.10.122

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Effect of trace amount of Sc and Zr on microstructure and mechanical properties of novel Al-Zn-Mg-Cu-Sc-Zr alloys are investigated. The samples were subjected to different annealing temperatures and various aging times. Analysis of microstructure and mechanical properties were carried out on TEM, EBSD technique, Vickers hardness test and tensile test. The results showed that abundant nanometer-sized Al-3(Sc, Zr) particles effectively pined dislocations and subgrain boundaries, exhibiting excellent antirecrystallization behavior and precipitates strengthening effect. Al-Zn-Mg-Cu alloys exhibited completely recrystallized structure after annealing at 470 degrees C for 1 h. However, the two Al-Zn-Mg-Cu-Sc-Zr alloys exhibited equiaxed grains at 600 degrees C. Besides, with the additions of Sc and Zr increased, a higher density of precipitates was detected obviously with excellent refinement effect. After solution-aging treatment, the maximum values of hardness, tensile strength and yield strength were 240 HV, 668 MPa, 628 MPa respectively, which were obtained by Al-Zn-Mg-Cu-0.22Sc-0.40Zr alloy at 120 degrees C for 24 h. The grain refinement strengthening and precipitation strengthening play a dominant role in the additional strength of the Al-Zn-Mg-Cu-Sc-Zr alloys. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：717 / 725

页数：9

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