Effect of long-period stacking ordered phase on mechanical properties of Mg97Zn1Y2 extruded alloy
Effect of long-period stacking ordered phase on mechanical properties of Mg97Zn1Y2 extruded alloy
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DOI：
10.1016/j.actamat.2010.07.050
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发表时间：
2010-11-01
期刊：
影响因子：
9.4
通讯作者：
Umakoshi, Y.
中科院分区：
文献类型：
--
作者：
Hagihara, K.;Kinoshita, A.;Umakoshi, Y.
Mg97Zn1Y2 挤压合金由 Mg 基体相和体积分数约为 24% 的长周期堆叠有序相（即所谓的 LPSO 相）组成，通过室温压缩试验研究了其力学性能。 400℃以上高温下的各种热处理使显微组织发生了很大程度的变化，并阐明了显微组织与力学性能之间的关系。将Mg,/LPSO两相合金的塑性行为与几乎由Mg固溶相组成的Mg99.2Zn0.2Y0.6合金的塑性行为进行了比较，并讨论了Mg97Zn1Y2挤压合金的强化机制。 LPSO相的存在强烈促进了挤压过程中镁基体晶粒的细化，从而通过Hall-Petch关系导致屈服应力大幅增加。此外，Mg97Zn1Y2挤压合金中沿挤压方向排列的LPSO相充当硬化相，与短纤维增强机制大致协调。 (C) 2010 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
The mechanical properties of Mg97Zn1Y2 extruded alloy, composed of Mg matrix phase and a long-period stacking ordered phase, the so-called LPSO phase, with a volume fraction of approximately 24%, were investigated using compression tests at room temperature. The microstructure was varied to a large degree by various heat treatments at high temperatures above 400 degrees C, and the relationship between the microstructure and mechanical properties was clarified. The plastic behavior of the Mg,/LPSO two-phase alloy was compared with that of Mg99.2Zn0.2Y0.6 alloy, composed almost Mg-solid-solution phase, and the strengthening mechanisms at work in the Mg97Zn1Y2 extruded alloy are discussed. The existence of the LPSO phase strongly enhanced the refinement of Mg matrix grains during extrusion, which led to a large increase in yield stress through the Hall-Petch relationship. In addition, the LPSO phases, which were aligned along the direction of extrusion in the Mg97Zn1Y2 extruded alloy, acted as hardening phases, being roughly coordinated with the short-fiber reinforcement mechanism. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.