Effect of T6-treatments on microstructure and mechanical properties of forged Al-4.4Cu-0.7Mg-0.6Si alloy

被引：17
作者：
Li, Hui-zhong [1 ,2 ,3 ]
Zhu, Ze-xiao [1 ]
Liang, Xiao-ping [1 ,2 ,3 ]
Li, Peng-wei [1 ,3 ]
Qi, Ye-long [1 ]
Lv, Feng [1 ]
Huang, Lan [3 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, Key Lab Nonferrous Met Mat Sci & Engn, Minist Educ, Changsha 410083, Hunan, Peoples R China
[3] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2017年 / 27卷 / 12期
基金：
中国国家自然科学基金;
关键词：
forged Al-4.4Cu-0.7Mg-0.6Si alloy; aging treatment; mechanical properties; theta precipitates; CU-MG ALLOY; PARTICLE BYPASS MECHANISMS; AGED AL-CU-MG-(AG) ALLOYS; ALUMINUM-ALLOY; TENSILE PROPERTIES; DISLOCATION CLIMB; PRECIPITATION; SI; KINETICS; COMPOSITES;
D O I：
10.1016/S1003-6326(17)60282-6
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Transmission electron microscopy (TEM), scanning electron microscopy (SEM), hardness tests and tensile tests were performed to investigate the effect of aging on microstructure and mechanical properties of forged Al-4.4Cu-0.7Mg-0.6Si alloy. The results show that the alloy exhibits splendid mechanical properties with an ultimate tensile strength of 504 MPa and an elongation of 10.1% after aging at 170 degrees C for 16 h. With tensile testing temperature increasing to 150 degrees C, the strength of the alloy declines slightly to 483 MPa. Then, the strength drops quickly when temperature reaches over 200 degrees C. The high strength of the alloy in peak-aged condition is caused by a considerable amount of theta' and AlMgSiCu (Q) precipitates. The relatively stable mechanical properties tested below 150 degrees C are mainly ascribed to the stability of theta' precipitates. The growth of theta' and Q precipitates and the generation of theta phase lead to a rapid drop of the strength when temperature is over 150 degrees C.
引用
收藏
页码：2539 / 2547
页数：9
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