Formation mechanisms of precipitates in an Al-Cu-Li-Zr alloy and their effects on strength and electrical resistance of the alloy

被引：25

作者：

Ahmadi, S. ^{[1
]}

Arabi, H. ^{[2
]}

Shokuhfar, A. ^{[3
]}

机构：

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

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

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

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 484卷 / 1-2期

关键词：

Aluminum-lithium alloys; DSC; Activation energy; Natural aging; Al-Cu-Li-Zr alloy; T(1) phase; Dissolution energies; AL-LI-CU-MG-(MN; AEROSPACE;

D O I：

10.1016/j.jallcom.2009.03.188

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Guinier-Preston(GP) zone formation and precipitation behavior of T(1) (Al(2)CuLi) phase during the aging of an Al-Cu-Li-Zr alloy was studied by differential scanning calorimetry(DSC) technique and electrical resistance measurement of the samples. Results show that precipitation of T(1) phase occurred in temperature range of 250-300 degrees C whereas its dissolution occurred within the temperature of 450-530 degrees C. Activation energies for precipitation and dissolution of T(1) phase which were determined for the first time in this research, were 122.1 kJ/mol and 130.3 kJ/mol respectively. Results of electrical resistance measurements showed that an increase in the age hardening time resulted in the reduction of electrical resistance of the samples. In addition, TEM observation showed that T(1) phase has plate shape morphology and its crystal structure is in the form of hexagonal close-packed. The lattice parameters were found to be: a = 0.4672 nm and c = 0.8785 nm. (C) 2009 Published by Elsevier B.V.

引用

页码：90 / 94

页数：5

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