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27卷    第7期    总第220期    2017年7月

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文章编号:1004-0609(2017)-07-1344-08
2124合金淬火后的室温停留效应
景慧博,柏振海,罗兵辉,尹 远,高 阳

(中南大学 材料科学与工程学院,长沙 410083)

摘 要: 为了探明2124合金的淬火后室温停留效应对合金力学性能的影响并找到应对措施,运用拉伸试验、硬度试验、电导率测试、DSC测试、XRD实验、EDS、TEM实验手段对2124合金淬火后室温停留不同时间的力学性能、相变过程及显微组织进行分析。结果表明:合金淬火后室温停留降低2124合金随后185 ℃人工时效的峰值强度,屈服强度最大降低60 MPa,伸长率略有升高,但低于1.5%;室温停留阶段合金内部析出物为GPB区,并且位错密度降低;室温停留24 h后185 ℃人工时效阶段主要强化相S相的析出激活能由淬火后直接时效的56.8 kJ/mol上升至72.7 kJ/mol,室温停留阶段位错密度的降低抑制了S相的非均匀析出是导致S相析出激活能升高的原因之一;在淬火后对材料进行3%冷变形即可消除室温停留对2124合金强度、硬度带来的不利影响。

 

关键字: 2124合金;力学性能;淬火后室温停留;S相

Effect of room temperature delay on quenched 2124 alloy
JING Hui-bo, BAI Zhen-hai, LUO Bing-hui, YIN Yuan, GAO Yang

School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract:To figure out the effects and reason of room temperature delay of 2124 alloy, and to find a countermeasure, mechanical property tester, hardness and electrical conductivity tests, DSC, XRD, EDS and TEM tests were used to analyze the mechanical property, phase transformation and microstructure of 2124 alloy. The result indicates that, the room temperature delay significantly reduces the intensity of 2124 alloy under followed peak aging at 185 ℃ whose σ0.2 can reduce up to 60 MPa, while the increase of elongation rate is lower than 1.5%. GPB forms during the room temperature delay, meanwhile, the density of dislocation decreases. The activation energy of S phase, the main strengthening phase of 2124 alloy under peak aging at 185 ℃, increases from 56.8 kJ/mol of alloy as-quenched to 72.7 kJ/mol of alloy as-delayed for 24 h at room temperature. The decrease of the density of dislocation, which restrains the inhomogeneous formation of S phase, is one of the reasons which result in this increase. 3% pre-deformation can eliminate the side effect of room temperature delay on 2124 alloy.

 

Key words: 2124 alloy; mechanical property; room temperature delay; S phase

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

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

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