A study of precipitation strengthening and recrystallization behavior in dilute Al-Er-Hf-Zr alloys

被引：41

作者：

Wu, H. ^{[1
]}

Wen, S. P. ^{[1
]}

Wu, X. L. ^{[1
]}

Gao, K. Y. ^{[1
]}

Huang, H. ^{[1
]}

Wang, W. ^{[1
]}

Nie, Z. R. ^{[1
]}

机构：

[1] Beijing Univ Technol, Sch Mat Sci & Engn, Beijing 100124, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 639卷

基金：

北京市自然科学基金; 对外科技合作项目（国际科技项目）;

关键词：

Aluminum alloy; Precipitation; Erbium; Hafnium; Zirconium; Recrystallization; 400; DEGREES-C; COARSENING RESISTANCE; ALUMINUM; EVOLUTION; ADDITIONS; YB; SI;

D O I：

10.1016/j.msea.2015.05.027

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A study on the precipitation hardening and recrystallization behavior of dilute Al-Er-Hf and Al-Er-Hf-Zr alloys has been carried out. The results show that both Al-0.045Er-0.18Hf and Al-0.045Er-0.08Zr-0.1Hf alloys can obtain remarkable age strengthening effect and recrystallization resistance. The precipitation hardening rate of Al-0.045Er-0.08Zr-0.T1 Hf is accelerated compared with that of the Al-0.045Er-0.18Hf alloy due to substituting 0.08 at% Zr for Hf, which can be ascribed to the sequential precipitation of solute elements on the basis of the disparity in their intrinsic diffusivities (D-Er > D-Zr > D-Hf). The peak hardness values for the Al-0.045Er-0.08Zr-0.1Hf are 644 MPa and 662 MPa after isochronal aging to 450 degrees C and isothermal aging at 350 degrees C for 84 h, respectively, which are higher than those of the Al-0.045Er-0.18Hf alloy. The recrystallization temperature of Al-Er-Hf-Zr alloy is 450 degrees C, about 25 degrees C higher than that of the Al-Er-Hf alloy due to the larger f/r ratio of precipitates in Al-Er-Hf-Zr alloys. (C) 2015 Elsevier B.V. All rights reserved,

引用

页码：307 / 313

页数：7

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