The effect of trace Sc on the quench sensitivity of AL-7Si-0.6 Mg alloys

被引：22

作者：

Tzeng, Yu-Chih ^{[2
]}

Wu, Chih-Ting ^{[3
]}

Lee, Sheng-Long ^{[1
,2
]}

机构：

[1] Natl Cent Univ, Inst Mat Sci & Engn, Jhongli 32001, Taiwan

[2] Natl Cent Univ, Dept Mech Engn, Jhongli 32001, Taiwan

[3] Army Acad ROC, Dept Vehicle Engn, Jhongli 32001, Taiwan

来源：

MATERIALS LETTERS | 2015年 / 161卷

关键词：

Metals and alloys; Cast; Scandium; Microstructure; Al3Sc; THERMAL-STABILITY; SI ALLOYS; PRECIPITATION; AL3SC; PHASE;

D O I：

10.1016/j.matlet.2015.08.108

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Jominy end quench test has been adopted to investigate the effect of trace scandium on the quench sensitivity of Al-7Si-0.6 Mg alloys. The results show that at a lower quenching rate, the preferred precipitation of the Al3Sc phase inhibits the formation of a beta'-Mg2Si phase, promoting the nucleation of finely dispersed metastable Mg2Si precipitates in the subsequent aging treatment. The quench sensitivity of the Al-7Si-0.6 Mg alloy was effectively improved by more than 60%. Rapid quenching rates can cause the Al matrix of the alloy to be in a supersaturated state, resulting in enhanced mechanical properties after aging treatment. In contrast, slow quenching rates precipitate the relatively coarse beta'-Mg2Si phase and also produce a precipitate free zone during the quenching process, thereby diminishing the mechanical properties of the alloy after the aging treatment, so that the Al-7Si-0.6 Mg alloy possesses higher quench sensitivity. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：340 / 342

页数：3

共 16 条

[1] The structural relation between precipitates in Al-Mg-Si alloys, the Al-matrix and diamond silicon, with emphasis on the trigonal phase U1-MgAl2Si2 [J].

Andersen, S. J. ;

Marioara, C. D. ;

Vissers, R. ;

Froseth, A. ;

Zandbergen, H. W. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2007, 444 (1-2) :157-169

[2] Modifying Al-7Si-0.35Mg alloys using equal channel angular extrusion [J].

Chou, Cheng-Yu ;

Wang, Kuan-Wen ;

Lee, Sheng-Long ;

Yang, Tzu-Shun .

MATERIALS LETTERS, 2008, 62 (15) :2469-2472

[3] Influence of Mg content on quench sensitivity of Al-Zn-Mg-Cu aluminum alloys [J].

Deng, Yun-lai ;

Wan, Li ;

Zhang, Yun-ya ;

Zhang, Xin-ming .

JOURNAL OF ALLOYS AND COMPOUNDS, 2011, 509 (13) :4636-4642

[4] The role of excess vacancies on precipitation kinetics in an Al-Mg-Sc alloy [J].

Fazeli, F. ;

Sinclair, C. W. ;

Bastow, T. .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2008, 39A (10) :2297-2305

[5] Morphology and thermal stability of Al-Mg-Si ternary alloy metastable precipitates formed in an aged at 403 K to 483 K [J].

Fukui, K ;

Takeda, M ;

Endo, T .

MATERIALS LETTERS, 2005, 59 (11) :1444-1448

[6]

Ma S., 2007, METALL MATER TRANS B, V26, P583

[7] Nanoscale structural evolution of Al3Sc precipitates in Al(Sc) alloys [J].

Marquis, EA ;

Seidman, DN .

ACTA MATERIALIA, 2001, 49 (11) :1909-1919

[8] Precipitation strengthening at ambient and elevated temperatures of heat-treatable Al(Sc) alloys (vol 50, pg 4021, 2002) [J].

Marquis, EA ;

Seidman, DN ;

Dunand, DC .

ACTA MATERIALIA, 2003, 51 (01) :285-287

[9] Precipitation of Al3Sc in binary Al-Sc alloys [J].

Novotny, GM ;

Ardell, AJ .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2001, 318 (1-2) :144-154

[10] The effect of solution heat treatment and quenching rates on mechanical properties and microstructures in AlSiMg foundry alloys [J].

Pedersen, L ;

Arnberg, L .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2001, 32 (03) :525-532

← 1 2 →