Al-Zn-Mg-Cu合金组织和电导率及抗应力腐蚀性能研究

材料热处理学报, 2008, 29(2): 108-113.

Al-Zn-Mg-Cu合金组织和电导率及抗应力腐蚀性能研究

宁爱林 ^1, , 刘志义 ^2, , 冯春 ^3, , 曾苏民 ^4,

1.中南大学材料科学与工程学院,湖南,长沙,410083;邵阳学院机械工程系,湖南,邵阳,422000

2.中南大学材料科学与工程学院,湖南,长沙,410083

3.中南大学材料科学与工程学院,湖南,长沙,410083

4.中南大学材料科学与工程学院,湖南,长沙,410083;邵阳学院机械工程系,湖南,邵阳,422000

基金项目: 国家高技术研究发展计划(863计划)(2001AA332030) 湖南省科技厅科技计划(05GK2018)

关键词：回归再时效 , 铝合金 , 电导率 , 应力腐蚀

Study of microstructure, electrical conductivity and stress corrosion resistance of Al-Zn-Mg-Cu alloys

研究了三种Al-Zn-Mg-Cu合金在回归再时效状态下的组织、电导率与抗应力腐蚀性能的关系.结果表明,电导率≥35.46%IACS的合金均表现出良好的抗应力腐蚀性能与较高的拉伸强度,晶界组织为粗大分立的η相,晶内为均匀弥散的GP区和η'相;而电导率≤34.63%IACS的合金虽然拉伸强度较高,但抗应力腐蚀性能较低,晶界组织为尺寸较小的链状η相.分析表明,相对常规T73等过时效状态的高电导率(38%～42%IACS),回归再时效状态弥散的晶内组织导致了较低的电导率和高抗拉强度,但粗大分立的晶界析出相仍然使其获得了优良的抗应力腐蚀性能,从而使合金表现出电导率适中(35.46%～36.82%IACS)、抗应力腐蚀性能良好和拉伸强度高的特点.

参考文献

[1]	邱成林;杨家翠;邵秀兰.铝标准和数据(AA美国铝业协会出版)[M].重庆:科学技术文献出版社重庆分社,1989:40-41.
[2]	T.C. Tsai;T.H. Chuang .Technical Note: Relationship Between Electrical Conductivity and Stress Corrosion Cracking Susceptibility of Al 7075 and Al 7475 Alloys[J].Corrosion: The Journal of Science and Engineering,1996(6):414-416.
[3]	T.C. TSAI;T.H. CHUANG .Atmospheric Stress Corrosion Cracking of a Superplastic 7475 Aluminum Alloy[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,1996(9):2617-2627.
[4]	P. GUYOT;L. COTTIGNIES .PRECIPITATION KINETICS, MECHANICAL STRENGTH AND ELECTRICAL CONDUCTIVITY OF AlZnMgCu ALLOYS[J].Acta materialia,1996(10):4161-4167.
[5]	Dorward R C .Precipitate coarsening during overageing of Al-Zn-Mg-Cu alloy[J].Materials Science and Technology,1999,15:1133-1138.
[6]	Puiggal M;Zialinski A .Effect of microstrucure on stress corrosion cracking of an Al-Zn-Mg-Cu alloy[J].Corrosion Science,1998,40(4-5):805-819.
[7]	Tzeng Mei-kuang;LIU Jun;JIN Zhen-hong.Role of Mg segregation to grain boundary in hydrngen-induced crack process of 7050 aluminum alloy[A].北京,1990:662-666.
[8]	WANG Lal-shen.Stress corrosion cracking of aluminium alloy[A].北京,1990:687-691.
[9]	Christodoulou L;Flowet H M .Hydrogen embritlement and trapping in Al-6% Zn-3 % Mg[J].Acta Metallurgica,1980,28:481-448.
[10]	Tsai T C;Chuang T H .Role of grain size in the stress corrosion cracking of 7475 aluminum alloy[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1997,225:135-144.
[11]	Talianker M;Cina B .Retrogsression and reaging and the role of dislocations in the stress corrosion of 7000-type aluminum alloys[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1989,20(10):2087.
[12]	M.J. STARINK;X.M. LI .A Model for the Electrical Conductivity of Peak-Aged and Overaged Al-Zn-Mg-Cu Alloys[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2003(4):899-911.

上一张下一张

计量

下载量()
访问量()

作者相关

文章评分

您的评分：
1

0%
2

0%
3

0%
4

0%
5

0%

材料期刊网