Microstructure characteristics and mechanical properties of new aerospace Al-Mg-Mn alloys with Al-3(Sc1-x Zr-x) or Al-3(Er1-xZrx) nanoparticles
Microstructure characteristics and mechanical properties of new aerospace Al-Mg-Mn alloys with Al-3(Sc1-x Zr-x) or Al-3(Er1-xZrx) nanoparticles
复制标题
Al-3(Sc1-x Zr-x)或Al-3(Er1-xZrx)纳米粒子新型航空航天Al-Mg-Mn合金的显微组织特征和力学性能
DOI：
10.1016/j.matchar.2019.04.032
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发表时间：
2019
影响因子：
4.7
通讯作者：
Xu Guofu
中科院分区：
文献类型：
--
作者：
Deng Ying;Zhang Guo;Yang Ziang;Xu Guofu
通过拉伸试验和电镜方法研究了两种分别含有0.10wt% Sc（低含量）和0.25wt% Er（廉价）的新型航空航天Al-6.00Mg-0.40Mn-0.12Zr（wt%）合金板材的显微组织和力学性能。结果表明，微合金元素以核壳结构的二次Al3(Sc1−xZrx)和Al3(Er1−xZrx)纳米粒子的形式存在，其核分别富集Sc和Er。稳定的核壳结构纳米颗粒使退火板材能够保留完全未再结晶的结构和强大的β纤维滚动织构。退火板的极限抗拉强度（UTS）、屈服强度（YS）和断裂伸长率（Elf）在Al-Mg-Mn-Sc-Zr合金中达到422±1MPa、312±6MPa和20.7±1.5%，在Al-Mg-Mn-Er-Zr合金中达到404±5MPa、283±7MPa和24.2±0.9%。分别表现出高强度和优异的延展性。球状Al3(Sc1−xZrx)和Al3(Er1−xZrx)颗粒的平均直径分别为12.1±4.2nm和20.2±8.4nm，Al3(Sc1−xZrx)和Al3(Er1−xZrx)沉淀物的数密度分别为(7.7±3.2)×1013m2和(6.4±1.9)×1012m2。 Al3(Sc1−xZrx) 较高的数密度和较小的粒径导致 Al-Mg-Mn-Sc-Zr 合金具有较高的强度。二次 Al3(Sc1−xZrx)/Al3(Er1−xZrx) 纳米粒子的主要强化机制与直接 Orowan 沉淀强化和亚结构强化有关。基于本文的结果，低Sc含量或廉价Er添加的新型Al-Mg-Mn-Zr合金可以同时实现增强机械性能和降低成本的目的，为新型高强度微合金化Al单键Mg合金在工业应用中的开发提供了巨大的潜力。
The microstructures and mechanical properties of two new aerospace Al-6.00 Mg-0.40Mn-0.12Zr (wt%) alloy sheets, containing 0.10 wt% Sc (low content) and 0.25 wt% Er(cheap), respectively, were investigated by tensile tests and electron microscopy methods. The results showed that microalloying elements were present in the form of core-shell-structured secondary Al3(Sc1−xZrx) and Al3(Er1−xZrx) nanoparticles, whose cores were enriched in Sc and Er, respectively. Stable core-shell structured nanoparticles enabled the annealed sheets to retain a completely non-recrystallized structure and strong β-fiber rolling textures. The ultimate tensile strength (UTS), yield strength (YS) and elongation to failure (Elf) of the annealed sheets reached 422 ± 1 MPa, 312 ± 6 MPa, and 20.7 ± 1.5% in the Al-Mg-Mn-Sc-Zr alloy, and 404 ± 5 MPa, 283 ± 7 MPa, and 24.2 ± 0.9% in the Al-Mg-Mn-Er-Zr alloy, respectively, both exhibiting high strength and superior ductility. The mean diameters of the spheroidal Al3(Sc1−xZrx) and Al3(Er1−xZrx) particles were 12.1 ± 4.2 nm and 20.2 ± 8.4 nm, respectively, meantime, the number densities of the Al3(Sc1−xZrx) and Al3(Er1−xZrx) precipitates were (7.7 ± 3.2) × 1013m2and (6.4 ± 1.9) × 1012m2. The higher number density and the smaller particle sizes of the Al3(Sc1−xZrx) leaded to the higher strength of the Al-Mg-Mn-Sc-Zr alloy. The main strengthening mechanisms from the secondary Al3(Sc1−xZrx)/Al3(Er1−xZrx) nanoparticles were associated with the direct Orowan precipitation strengthening and sub-structure strengthening. Based on the results of this paper, enhanced mechanical properties and a reduced cost can be simultaneously achieved with the new Al-Mg-Mn-Zr alloys with low Sc contents or inexpensive Er addition, offering great potential for the development of new high-strength micro-alloyed Alsingle bondMg alloys in industrial applications.