Effect of In Addition on Precipitation Process of Al-3.5Cu Alloy

被引：0

作者：

Pan Zhengrong ^{[1
]}

Zheng Ziqiao ^{[1
]}

Li Shichen ^{[1
]}

Liao Zhongquan ^{[1
]}

机构：

[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2011年 / 40卷 / 06期

关键词：

Indium; theta ' phase; microalloying; Al-Cu; precipitate; MECHANICAL-PROPERTIES; LI ALLOY; CU ALLOY; AL; NUCLEATION; THETA'; MICROSTRUCTURE; PHASE; WORK; SN;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The precipitation and coarsening behavior of theta' phase in Al-3.5Cu and Al-3.5Cu-0.5In alloys (mass fraction, %) were investigated by transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and some other methods. In addition markedly accelerates the aging response of Al-Cu alloy aged at 175 degrees C, and raises the peak hardness by about 200 MPa. TEM observation shows that In-rich particles precipitate uniformly at the early stage of aging, which will act as heterogeneous nucleation positions of theta' phase; In' is observed at a corner of platelets having their broad face in the plane of view; theta' phase is coarsened much more slowly in In-added alloy than in In-free alloy. With 6% pre-deformation before aging, these two alloys have similar aging response rate and strength, which confirms that in T6 state Indium facilitates theta' precipitation mainly through quenched-in vacancies.

引用

页码：1079 / 1083

页数：5

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