Effect of Extrusion Parameters on Mechanical Properties of Mg97Zn1Y2 Alloys at Room and Elevated Temperatures
Effect of Extrusion Parameters on Mechanical Properties of Mg97Zn1Y2 Alloys at Room and Elevated Temperatures
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DOI：
10.2320/matertrans.maw201026
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发表时间：
2010-09-01
影响因子：
1.2
通讯作者：
Kawamura, Yoshihito
中科院分区：
文献类型：
--
作者：
Hirano, Masaaki;Yamasaki, Michiaki;Kawamura, Yoshihito
研究了挤压比、挤压温度和挤压速度等挤压工艺参数对高强度Mg-Zn Y合金室温和高温力学性能及组织演变的影响。挤压态Mg 97 Zn 1 Y2合金的显微组织由热加工和动态再结晶（DRXed）组成，α-Mg晶粒包括沿挤出方向沿着伸长的纤维状LPSO相，而平均等效应变的增加促进α-Mg的DRX。Mg基体和纤维状LPSO相的弥散分布以及平均金属流速的增加有利于α-Mg g的动态再结晶，但不利于LPSO相的弥散分布。动态再结晶晶粒面积分数和纤维状LPSO相弥散分布的变化影响挤压Mg Zn Y合金的力学性能。成形的LPSO相随着挤压比和挤压速度的增加总DRX在α Mg基质相中引起其列中的克生长降低合金的拉伸强度，但在DRX晶粒区域中保留的分散的纤维状LPSO相改善了整体DRX随后晶粒生长的不利影响。doi 10 2320/matertransMAW 201026]
The effects of alloy extrusion parameters such as extrusion ratio temperature and speed on the mechanical properties at room and elevated temperatures and the microstructure evolution were investigated in the production of high strength Mg-Zn Y alloys The alloy used is a Mg97Zn1Y2 (at%) which is engineered to acquire a long period stacking ordered (LPSO) structure phase to increase alloy strength The microstructure of the extruded Mg97Zn1Y2 alloy consists of hot-worked and dynamically recrystallized (DRXed) alpha Mg grains that includes a fiber shaped LPSO phase elongated along the direction of extrusion Whereas an increase in average equivalent strain promotes the DRX of alpha-Mg matrix and the dispersion of the fiber shaped LPSO phase an increase in average metal flow rate is conductive to the DRX of alpha-Mg grams but is not to the dispersion of LPSO phase The mechanical properties of the extruded Mg Zn Y alloys are affected by changes in the area fraction of the DRXed grains and the dispersion of the fiber-shaped LPSO phase As the extrusion ratio and extrusion speed increase overall DRX bringing gram growth in its train in the alpha Mg matrix phase decreases the tensile strength of alloys, but the dispersed fiber shaped LPSO phase remaining in the DRXed grains region makes good the adverse effect of overall DRX followed by grain growth [doi 10 2320/matertrans MAW201026]