Effects of uniaxial creep ageing on the mechanical properties and micro precipitates of Al-Li-S4 alloy
Effects of uniaxial creep ageing on the mechanical properties and micro precipitates of Al-Li-S4 alloy
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单轴蠕变时效对Al-Li-S4合金力学性能和微析出相的影响
DOI：
10.1016/jansea.2017.01.081
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发表时间：
2017-03
期刊：
影响因子：
6.4
通讯作者：
Yang Yingge
中科院分区：
文献类型：
--
作者：
Hu Libin;Zhan Lihua;Shen Rulin;Liu Zhilin;Ma Ziyao;Liu Jian;Yang Yingge
研究了蠕变时效对Al-Li-S4合金力学性能和显微析出相的影响。结果表明，与单一无应力时效（SFA）相比，CA显著提高了Al-Li-S4合金的硬度、强度和伸长率等力学性能。同时，CA处理也延长了峰值时效时间。当试样在153 °C下CA处理25 h后继续置于240 MPa的外应力下时，更多的T1（Al 2CuLi）纳米析出物产生，并进一步有助于力学性能的改善。这主要归因于外部应力促进了T1纳米析出相的形成。此外，CA能够限制析出相在晶界处的粗化和无析出区的形成。此外，还分别对SFA处理和CA处理的Al-Li-S4拉伸试样进行了断口分析。通过控制CA处理过程中细小T1纳米析出相的形成过程，可以促进Al-Li-S4合金获得具有良好力学性能的新型组织。
In the present work, effects of creep ageing (CA) on the mechanical properties and micro precipitates of Al-Li-S4 alloy was investigated. Compared with single stress-free ageing (SFA), experimental results show that CA has significantly improved the mechanical properties of Al-Li-S4 alloy, including hardness, strength and elongation. Meanwhile, the peak-ageing time was also prolonged under CA treatment. When specimens were continuously placed under an exterior stress of 240 MPa after CA treatment at 153 °C for 25 h, more T1(Al2CuLi) nano-precipitates developed and further contributed improvement in mechanical properties. It is mainly attributed to the exterior stress that promoted to form T1nano-precipitates. Moreover, CA enabled to restrict both the coarsening of precipitates at grain boundaries and the formation of precipitation free zone. In addition, fractographic examination of SFA-treated and CA-treated Al-Li-S4 tensile specimens were carried out, respectively. Through controlling the formation process of fine T1nano-precipitates during CA treatment, it can facilitate the development of novel microstructures in Al-Li-S4 alloys with certain promising mechanical properties.
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DOI：
10.1016/j.msea.2016.01.074
发表时间：
2016-03
影响因子：
6.4
作者：
Yong Li;Z. Shi;Jianguo Lin;Yo-Lun Yang;B. Huang;Tsai-Fu Chung;J. R. Yang
通讯作者：
Yong Li;Z. Shi;Jianguo Lin;Yo-Lun Yang;B. Huang;Tsai-Fu Chung;J. R. Yang
DOI：
10.1016/0001-6160(87)90210-0
发表时间：
1987
期刊：
Acta Metallurgica
影响因子：
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作者：
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通讯作者：
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DOI：
10.1007/s11661-012-1155-z
发表时间：
2012-09-01
影响因子：
2.8
作者：
Rioja, Roberto J.;Liu, John
通讯作者：
Liu, John
DOI：
10.1016/0025-5416(80)90110-x
发表时间：
1980-05
期刊：
Materials Science and Engineering
影响因子：
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作者：
T. Sanders;E. Ludwiczak;R. R. Sawtell-R.
通讯作者：
T. Sanders;E. Ludwiczak;R. R. Sawtell-R.
DOI：
10.4028/www.scientific.net/msf.217-222.1257
发表时间：
1996-01-01
期刊：
ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3
影响因子：
--
作者：
Nie, JF;Muddle, BC;Polmear, IJ
通讯作者：
Polmear, IJ