Effect of natural ageing and pre-straining on the hardening behaviour and microstructural response during artificial ageing of an Al–Mg–Si–Cu alloy
Effect of natural ageing and pre-straining on the hardening behaviour and microstructural response during artificial ageing of an Al–Mg–Si–Cu alloy
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自然时效和预应变对Al-Mg-Si-Cu合金人工时效硬化行为和显微组织响应的影响
DOI：
10.1016/j.matdes.2016.01.119
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发表时间：
2016-04
影响因子：
8.4
通讯作者：
Suping Pan
中科院分区：
文献类型：
--
作者：
Deyan Yin;Qiao Xiao;Yuqiang Chen;Huiqun Liu;Danqing Yi;Bin Wang;Suping Pan
采用热挤压工艺制备了Al-0.42Mg-0.5Si-1.0Cu合金，并对其进行了淬火和时效处理。淬火后立即保持和预应变进行时效前，研究自然时效和预应变的时效硬化和合金的显微组织响应的影响，硬度测量，TEM和HRTEM表征。结果表明，室温保持导致后续人工时效合金峰值时效硬度的损失。随着保温时间的延长，时效峰硬度降低，时效峰时间延长。自然时效引起的团簇/GP区的形成降低了β″和Q′相的密度，从而降低了峰值时效强化。时效前预应变显著提高了合金的峰值时效硬度，缩短了峰值时效时间。在后续人工时效初期，通过抑制团簇/GP区的形成，促进β″和Q′形核，显著减轻了自然时效对合金后续人工时效硬化行为的影响。在过时效阶段，预应变诱发的位错促进了析出相的粗化，从而导致硬度明显下降。
Al–0.42Mg–0.5Si–1.0Cu alloy was prepared by hot extrusion, followed by quenching and ageing treatment. The keeping and pre-straining immediately after quenching were performed before ageing, to investigate natural ageing and pre-straining effects on the age-hardening and microstructural response of the alloy, hardness measurement, TEM, and HRTEM characterisation were used. The results indicated that, room-temperature keeping led to a loss of peak ageing hardness for subsequent artificially aged alloy. The peak ageing hardness decreased and the peak ageing time increased with increasing keeping time. The formation of clusters/GP zones induced by natural ageing decreased the densities of β″ and Q′ phases, which contributed to the decrease of peak-ageing strengthening. Pre-straining before ageing significantly increased the peak ageing hardness and shortened the peak ageing time of the alloy. Furthermore, it significantly mitigated the effects of natural ageing on the hardening behaviour of the alloy during subsequent artificial ageing by restraining the formation of clusters/GP zones and accelerating the nucleation of β″ and Q′ phases in the early stage of subsequent artificial ageing. In the over-ageing stage, dislocations induced by pre-straining facilitated the coarsening of precipitates and consequently led to an apparent decrease of hardness.
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影响因子：
6
作者：
L. Zhen;S. Kang
通讯作者：
L. Zhen;S. Kang
不同Mg/Si比和Cu添加量的Al-Mg-Si-Cu合金的自然时效和沉淀硬化行为
DOI：
10.1016/j.msea.2014.12.086
发表时间：
2015-03-11
影响因子：
6.4
作者：
Ding, Lipeng;Jia, Zhihong;Yang, Guang
通讯作者：
Yang, Guang
Al-Cu-Mg 合金的传统热机械工艺，可在保持高强度的同时提高延展性
影响因子：
6
作者：
Huang, Y. J.;Chen, Z. G.;Zheng, Z. Q.
通讯作者：
Zheng, Z. Q.
影响因子：
6
作者：
K. Matsuda;S. Ikeno;Tatsuo Sato;Y. Uetani
通讯作者：
K. Matsuda;S. Ikeno;Tatsuo Sato;Y. Uetani
影响因子：
2.2
作者：
C. Chang;I. Wieler;N. Wanderka;J. Banhart
通讯作者：
C. Chang;I. Wieler;N. Wanderka;J. Banhart