Role of Yb and Si on the precipitation hardening and recrystallization of dilute Al-Zr alloys

被引：45
作者：
Wen, S. P. [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：
JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 599卷
基金：
对外科技合作项目（国际科技项目）;
关键词：
Aluminum alloy; Age hardening; Precipitation; Ytterbium; Zirconium; TI ADDITIONS; SC; EVOLUTION; NUCLEATION; STABILITY; ELEMENTS; AMBIENT; PHASE; ER;
D O I：
10.1016/j.jallcom.2014.02.065
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：
The effect of Yb and Si on precipitation hardening and recrystallization of Al-Zr alloys have been investigated. The results show that Yb is more effective than Si to accelerate the precipitation kinetics and stimulate the precipitation of Al-Zr alloy. The peak hardness values for the Al-Yb-Si-0.08Zr are 510 MPa and 515 MPa after isochronal aging to 425 degrees C and isothermal at 350 degrees C for 200 h, respectively, which are significantly larger than that of the Al-Yb-Zr and Al-Si-Zr alloys. The precipitates in alloys with addition of Zr are more thermally stable than that of the Al-Yb alloy. The recrystallization temperatures of Al-Zr, Al-Si-Zr, Al-Yb-Zr and Al-Yb-Si-Zr alloys are 250, 400, 425 and 450 degrees C, respectively, increase with the increase of the corresponding peak aging hardness. The recrystallization temperature of Al-Yb alloy is 325 degrees C, which is much lower than that of the Al-Yb-Zr alloy due to the coarsening of the Al3Yb at temperature larger than 300 degrees C. (C) 2014 Elsevier B. V. All rights reserved.
引用
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页码：65 / 70
页数：6
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