Effect of forced-air cooling on the microstructure and age-hardening response of extruded Mg-Gd-Y-Zn-Zr alloy full with LPSO lamella
Effect of forced-air cooling on the microstructure and age-hardening response of extruded Mg-Gd-Y-Zn-Zr alloy full with LPSO lamella
复制标题
强制风冷对全LPSO片层挤压Mg-Gd-Y-Zn-Zr合金显微组织和时效硬化响应的影响
DOI：
10.1016/j.jmst.2020.09.020
复制
发表时间：
2020-09
影响因子：
10.9
通讯作者：
Fan G. H.
中科院分区：
文献类型：
--
作者：
Wu S. Z.;Nakata T.;Tang G. Z.;Xu C.;Wang X. J.;Li X. W.;Qiao X. G.;Zheng M. Y.;Geng L.;Kamado S.;Fan G. H.
本文对含有片状长周期有序相(LPSO)的均匀化Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr(wt.%)合金在常压下进行了热挤压和强制空气冷却，研究了强迫空气冷却对合金组织和时效硬化响应的影响。结果表明，与挤压样品在大气中冷却相比，强制风冷限制了动态再结晶(DRX)，使动态再结晶(DRXed)晶粒度更细，基面织构更强，位错密度更高。此外，强风冷却促进了非再结晶区的动态析出，促进了未再结晶区间距较小的片状LPSO相和γ‘相的形成，对时效过程中β’相的析出有一定的抑制作用。经峰时效处理后，经强制风冷的挤压试样具有优良的拉伸性能，拉伸屈服强度为439 Mpa，极限拉伸强度为493 Mpa，断裂伸长率为18.6%。
The homogenized Mg-8.2Gd-3.8Y-1.0Zn-0.4 Zr (wt.%) alloy full of plate-shaped long period stacking ordered (LPSO) phases was hot extruded in the atmosphere and cooled by the forced-air, then the effect of forced-air cooling on the microstructure and age-hardening response of the alloy was investigated in this work. The results show that in comparison with the extruded sample cooling in the atmosphere, the forced-air cooling restricts dynamic recrystallization (DRX) and brings about finer dynamic recrystallized (DRXed) grain size, stronger basal texture and higher dislocation density. Furthermore, the forced-air cooling promotes the dynamic precipitation in the DRXed regions and facilitates formation of plate-shaped LPSO phases and γ′ phases with smaller interspacing in the unrecrystallized (unDRXed) regions, then slightly restricts the precipitation of β′ phases during aging. After peak-ageing treatment, the extruded sample with forced-air cooling shows superior tensile properties with a tensile yield strength of 439 MPa, an ultimate tensile strength of 493 MPa, and elongation to failure of 18.6 %.
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影响因子：
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作者：
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