Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第20卷    第11期    总第140期    2010年11月

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文章编号:1004-0609(2010)11-2106-06
2124铝合金蠕变时效的微结构与性能
邓运来1, 2, 周 亮1, 2, 晋 坤1, 2, 张新明1, 2

(1. 中南大学 材料科学与工程学院,长沙 410083;
2. 中南大学 有色金属材料科学与工程教育部重点实验室,长沙 410012
)

摘 要: 研究蠕变时效前预处理(15%预变形+100 ℃预时效5 h)对可热处理强化2124铝合金蠕变时效成形的影响。采用SEM分析、TEM分析以及测定电导率、维氏硬度和拉伸性能等手段,分析两种不同初始状态试样经过蠕变时效后的微结构和性能。结果表明:初始预处理降低了蠕变时效过程中蠕变初始阶段的蠕变伸长率,但增大了稳态蠕变阶段的蠕变速率;初始预处理对基体中粗大Fe、Si相有一定的破碎作用,蠕变时效过程中,粗大粒子在蠕变应力作用下进一步被破碎;预处理能够改善第二相的析出形态和分布,使析出相分布均匀;预处理试样的电导率比未预处理试样的电导率高,其硬度和强度也较高,但伸长率较低。

 

关键词: 蠕变时效;预处理;微结构;力学性能

Microstructure and properties of creep aged 2124 aluminum alloy
DENG Yun-lai1, 2, ZHOU Liang1, 2, JIN Kun1, 2, ZHANG Xin-ming1, 2

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410012, China

Abstract:The effect of pre-treatment(15% pre-deformation +100 ℃ pre-aging for 5 h)on creep age forming of aluminum alloy 2124 sheets, which can be enhanced by heat treatment, was investigated. The microstructures and properties of two sheets with different pre-treatments were analysed by means of SEM, TEM and measuring the electrical conductivity, Vickers hardness and tensile performance. The results show that the pre-treatment reduces the elongation of the initial stage of creep, but increases the steady-state creep rate; the coarse Fe and Si second phase particles are crushed to certain degree by the pre-treatment, and such coarse particles are further broken down by the subsequent creep stress. The morphology and distribution of the precipitated second phase particles are also improved by pre-treatment. The pre-treated sample depicts higher electrical conductivity, hardness and strength but smaller elongation rate than the non-pre-treated one.

 

Key words: creep aging; pre-treatment; microstructure; mechanical property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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