Effects of Multiple Strengthening Treatments on Mechanical Properties and Stability of Nanoscale Precipitated Phases in an Aluminum-Copper-Lithium Alloy

被引：6

作者：

Ahmadi, S. ^{[1
]}

Arabi, H. ^{[2
]}

Shokuhfar, A. ^{[3
]}

机构：

[1] Tarbiat Modares Univ, Dept Mat Sci, Fac Engn, Tehran, Iran

[2] IUST, CEAMP, Dept Met & Mat Sci & Engn, Tehran, Iran

[3] KN Toosi Univ Technol, Dept Mat Sci, Fac Mech Engn, Tehran, Iran

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2010年 / 26卷 / 12期

关键词：

Multiple strengthening; Thermo mechanical treatment (TMT); Selected area electron diffraction (SAED) pattern; Inter planar spacing (d); CU-MG ALLOYS; AL-LI ALLOY; ZR ALLOY; AEROSPACE;

D O I：

10.1016/S1005-0302(11)60004-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Effects of multiple strengthening treatments (i.e. aging either at three or four consecutive temperatures) on mechanical properties and stability of nanoscale precipitated phases in an AA2090 alloy have been evaluated in this research. Various tests such as hardness, tensile, electrical resistance, differential scanning calorimetric (DSC), and transmission electron microscopy (TEM) have been performed. The results show that the ultimate tensile strength (UTS) and the yield strength of the samples aged at four consecutive temperatures (i.e. natural aging+190 degrees C+150 degrees C+100 degrees C) can be increased approximately to 660 and 610 MPa, respectively. It is also found that precipitation of T1 phase occurs during multiple aging process of the alloy and the higher amounts of enthalpies shown in DSC charts are linked to higher volume fraction of this precipitate. Furthermore, TEM observations reveal that T1 phase has plate shape morphology and its crystal structure is in the form of hcp with lattice parameters of a=0.467 nm and c=0.878 nm.

引用

页码：1078 / 1082

页数：5

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