Revealing the coarsening behavior of precipitates and its effect on the thermal stability in Tʹ and ηʹ dual-phase strengthened Al-Zn-Mg-Cu alloys

IF 11.2 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Science & Technology Pub Date : 2024-09-24 DOI:10.1016/j.jmst.2024.09.010
Yan Zou, Lingfei Cao, Xiaodong Wu, Chenglin Mou, Songbai Tang
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Abstract

High-strength Al-Zn-Mg-Cu alloys are widely utilized, but their strength deteriorates as strengthening precipitates coarsen rapidly at elevated temperatures, limiting their applications above 150°C. This study systematically investigates the microstructure evolution and its impact on the properties of peak-aged Al-Zn-Mg-Cu alloys with varying Zn/Mg ratios during thermal exposure at a series of temperatures from 150 to 300°C for 500 h. The results reveal that alloys A1 and A2 with an optimal Zn/Mg ratio (1.50−2.14) and relatively lower (Zn + Mg) content (7.0−8.8 wt.%), exhibit superior heat resistance properties compared to the other three alloys. Despite having lower strength relative to alloys with higher solute content, peak-aged alloys A1 and A2 retain the highest strength after thermal exposure. This performance is attributed to the high proportion (over 80%) of T′/T phases in the precipitates for alloys A1 and A2, which demonstrate better thermal stability in comparison to η′/η phases. Additionally, the lower solute content reduces the driving force for diffusion of Zn and Mg atoms, thus inhibiting the coarsening of precipitates. Moreover, the study elucidates that the coarsening mechanism of precipitates transitions from interfacial diffusion control at 150°C to matrix diffusion control at 200−300°C. These insights into the composition-dependent coarsening behavior of precipitates in dual-phase strengthened Al-Zn-Mg-Cu alloys offer valuable guidance for designing heat-resistant aluminum alloys with enhanced performance at elevated temperatures.

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揭示析出物的粗化行为及其对 Tʹ 和 ηʹ 双相强化铝锌镁铜合金热稳定性的影响
高强度铝-锌-镁-铜合金被广泛使用,但其强度会随着强化析出物在高温下迅速粗化而下降,从而限制了其在 150°C 以上温度下的应用。本研究系统研究了不同锌/镁比的峰值时效铝锌镁铜合金在一系列温度(150 至 300°C)下热暴露 500 小时期间的微观结构演变及其对合金性能的影响。结果表明,与其他三种合金相比,最佳锌/镁比(1.50-2.14)和相对较低(锌+镁)含量(7.0-8.8 wt.%)的合金 A1 和 A2 具有更优越的耐热性能。尽管与溶质含量较高的合金相比,峰值时效合金 A1 和 A2 的强度较低,但在热暴露后仍能保持最高强度。这种性能归因于合金 A1 和 A2 的沉淀物中 T′/T 相的比例较高(超过 80%),与 η′/η 相相比,T′/T 相具有更好的热稳定性。此外,较低的溶质含量降低了锌和镁原子扩散的驱动力,从而抑制了沉淀的粗化。此外,研究还阐明了沉淀物的粗化机制从 150°C 时的界面扩散控制过渡到 200-300°C 时的基质扩散控制。这些对双相强化铝-锌-镁-铜合金中析出物粗化行为的成分依赖性的见解,为设计在高温下性能更强的耐热铝合金提供了宝贵的指导。
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来源期刊
Journal of Materials Science & Technology
Journal of Materials Science & Technology 工程技术-材料科学:综合
CiteScore
20.00
自引率
11.00%
发文量
995
审稿时长
13 days
期刊介绍: Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.
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