Effects of minor Sc on the microstructure and mechanical properties of Al-Zn-Mg-Cu-Zr based alloys

被引：26
作者：
Li Wenbin [1 ,2 ]
Pan Qinglin [1 ]
Zou Liang [1 ]
Liang Wenjie [1 ]
He Yunbin [1 ]
Liu Junsheng [1 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Hunan City Univ, Dept Civil Engn, Yiyang 413000, Peoples R China
来源：
RARE METALS | 2009年 / 28卷 / 01期
关键词：
aluminum alloy; scandium; ingot metallurgy; microstructure; mechanical properties; MORPHOLOGY; ADDITIONS; STRENGTH; CAST;
D O I：
10.1007/s12598-009-0020-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Five kinds of Al-Zn-Mg-Cu-Zr based alloys with different Sc additions were prepared by ingot metallurgy. The effects of minor Sc on the microstructure and mechanical properties of Al-Zn-Mg-Cu-Zr based alloys were investigated using tensile tests, optical microscopy ( OM), and transmission electron microscopy (TEM). The results show that the ultimate tensile strength and yield strength are improved by 94 and 110 MPa, respectively, and the elongation to failure remains at a reasonable extent (11.1%) in the Al-Zn-Mg-Cu-Zr based alloy with 0.21 wt.% Sc addition after solution heat treatment at 475 degrees C for 40 min and then aged at 120 degrees C for 24 h. The addition of minor Sc induces the formation of Al(3)(Sc,Zr) particles, which are highly effective in refining the cast microstructures, retarding recrystallization, and pinning dislocations. The increment of strength is attributed mainly to fine grain strengthening, precipitation strengthening of Al(3)(Sc,Zr) particles, and substructure strengthening.
引用
收藏
页码：102 / 106
页数：5
相关论文
共 15 条
[1]   The effect of small scandium additions to AA7050 on the As-cast and homogenized microstructure [J].
Costello, FA ;
Robson, JD ;
Prangnell, PB .
ALUMINUM ALLOYS 2002: THEIR PHYSICAL AND MECHANICAL PROPERTIES PTS 1-3, 2002, 396-4 :757-762
[2]  
HAKON H, 2004, MAT SCI ENG A-STRUCT, V387, P936
[3]   Effect of minor Sc and Zr on microstructure and mechanical properties of Al-Zn-Mg-Cu alloy [J].
He Yong-dong ;
Zhang Xin-ming ;
You Jiang-hai .
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, 2006, 16 (05) :1228-1235
[4]   The effect of cooling rate on the morphology of primary Al3Se intermetallic particles in Al-Sc alloys [J].
Hyde, KB ;
Norman, AF ;
Prangnell, PB .
ACTA MATERIALIA, 2001, 49 (08) :1327-1337
[5]   Coherency between Al3Sc precipitate and the matrix in Al alloys containing Sc [J].
Iwamura, S ;
Nakayama, M ;
Miura, Y .
ALUMINUM ALLOYS 2002: THEIR PHYSICAL AND MECHANICAL PROPERTIES PTS 1-3, 2002, 396-4 :1151-1156
[6]   Effect of alloying elements on the strength and casting characteristics of high strength Al-Zn-Mg-Cu alloys [J].
Kim, KT ;
Kim, JM ;
Sung, KD ;
Jun, JH ;
Jung, WJ .
PRICM 5: THE FIFTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-5, 2005, 475-479 :2539-2542
[7]   Effect of aging on the mechanical properties and corrosion susceptibility of an Al-Cu-Li-Zr alloy containing Sc [J].
Liang Wenjie ;
Pan Qinglin ;
He Yunbin ;
Li Yunchun ;
Zhou Yingchun ;
Lu Congge .
RARE METALS, 2008, 27 (02) :146-152
[8]   'Sc effect' of improving mechanical properties in aluminium alloys [J].
Milman, YV ;
Lotsko, DV ;
Sirko, OI .
ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 2000, 331-3 :1107-1111
[9]   A study of coarsening, recrystallization, and morphology of microstructure in Al-Sc-(Zr)-(Mg) alloys [J].
Riddle, YW ;
Sanders, TH .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2004, 35A (01) :341-350
[10]   Influence of different minor additions on structure and properties of high-strength Al-Zn-Mg-Cu alloy sheets [J].
Senatorova, OG ;
Uksusnikov, AN ;
Legoshina, SF ;
Fridlyander, IN ;
Zhegina, IP .
ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 2000, 331-3 :1249-1253
12