Design, evolution, formation and effect mechanism of coupling distributed soft and hard micro-regions in Al–Zn–Mg–Cu–Fe alloys with high formability

Design, evolution, formation and effect mechanism of coupling distributed soft and hard micro-regions in Al–Zn–Mg–Cu–Fe alloys with high formability
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高成形性Al-Zn-Mg-Cu-Fe合金软硬耦合分布微区的设计、演化、形成及作用机制

DOI:
10.1016/j.msea.2022.143951
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发表时间:
2022-10
期刊:
Materials Science & Engineering A
影响因子:
--
通讯作者:
Linzhong Zhuang
Linzhong Zhuang
中科院分区:
其他
文献类型:
--
作者:
Liangliang Yuan;Mingxing Guo;Xueguang Dong;Linzhong Zhuang

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在此,我们报道了分布软硬耦合微区的设计、演化、形成和作用机理,并提出了避免Al-Zn-Mg-Cu合金强度-成形性权衡的机制。结果表明,通过精确的理论计算和热机械加工控制,可以形成软硬微区的耦合分布,即软硬微区的球壳分布。同时,可以诱导合金中细晶和粗晶的非均匀分布,使合金的平均塑性应变比r值大大提高到0.761。这一数值远高于其他具有类似极限抗拉强度的7xxx系列铝合金。基于显微组织的演变,提出了非均匀分布的形成机制。这些发现为设计和开发高强度、高成形性的Al-锌-镁-铜合金和其他铝合金提供了新的策略。
Here, we report the design, evolution, formation and effect mechanism of coupling distributed soft and hard micro-regions, and propose the mechanism of evading the strength-formability trade-off dilemma for Al–Zn–Mg–Cu alloys. The results show that the coupling distributed soft and hard micro-regions, i.e., spherical shell distribution of soft and hard micro-regions, can be formed based on the precise theoretical calculation and thermomechanical processing control. Simultaneously, a heterogeneous grain distribution of fine and coarse grains can be induced in the alloys, which results in the greatly improved average plasticity-strain ratio r to the value of 0.761. This value is much higher than those of the other 7xxx series Al alloys with a similar ultimate tensile strength. Based on the microstructure evolution, the forming mechanism of heterogeneous grain distribution was proposed. These findings shed light on new strategies for designing and developing high-strength and high-formability Al–Zn–Mg–Cu alloys and other Al alloys.
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