甄睿,孙扬善,沈学为.Zn含量对Mg-6Gd-4Y变形镁合金显微组织与力学性能的影响[J].稀有金属材料与工程,2018,47(10):2957~2963.[Zhen Rui,Sun Yangshan,Shen Xuewei.Effect of Zn content on the microstructure and mechanical properties of the extruded Mg-6Gd-4Y alloy[J].Rare Metal Materials and Engineering,2018,47(10):2957~2963.]
Zn含量对Mg-6Gd-4Y变形镁合金显微组织与力学性能的影响
投稿时间:2017-03-28  修订日期:2017-05-18
中文关键词:  镁合金  长周期结构 (LPSO)  热挤压  时效处理  拉伸强度
基金项目:
中文摘要:
      研究了Mg-6Gd-4Y(wt.%)合金与添加1%Zn的Mg-6Gd-4Y-1Zn合金的显微组织与力学性能。结果表明:Mg-6Gd-4Y合金的铸态组织由?-Mg基体和Mg24(GdY)5两相组成。而含有Zn的Mg-6Gd-4Y-1Zn合金的铸态组织则主要由α-Mg,Mg24(GdY)5和具有18R-LPSO结构的Mg12Y1Zn1相组成。挤压后,在含锌合金中发现了14H-LPSO相,分布于条状分布的Mg12Y1Zn1之间。14H-LPSO相的形成机理为沉淀析出,反应可表示为α-Mg′→α-Mg + 14H。Zn含量对β系列沉淀物没有明显的影响。在Mg-6Gd-4Y合金和Mg-6Gd-4Y-1Zn合金上进行的时效(T6和T5)处理均引起β"析出相的形成。T6处理后的Mg-6Gd-4Y-1Zn合金具有高拉伸强度和良好的延展性,屈服强度(YS),抗拉强度(UTS)和延伸率分别为309MPa,438MPa和6.8%。这是18R-LPSO相与细小弥散分布的14H-LPSO相和β"沉淀相共同作用的结果。
Effect of Zn content on the microstructure and mechanical properties of the extruded Mg-6Gd-4Y alloy
英文关键词:magnesium alloy  long period stacking ordered structures (LPSO)  hot extrusion  aging  tensile strength
英文摘要:
      Microstructures and mechanical properties of the Mg-6Gd-4Y(wt.%) alloys with and without 1% Zn additions have been investigated. The results showed that the as-cast microstructure of the Mg-6Gd-4Y alloy studied consisted of the α-Mg matrix and Mg24(GdY)5 secondary phase. However, the as-cast microstructure of the Zn-containing Mg-6Gd-4Y-1Zn alloy studied consisted of the ?-Mg matrix, Mg24(GdY)5 secondary phase and Mg12Y1Zn1 phase which had a 18R long period staking ordered (18R-LPSO) structure. After extrusion the 14H-LPSO phase had been found in the Zn-containing alloy and distributed between the 18R-LPSO strips in the as extruded microstructure. The formation mechanism of the 14H-LPSO phase is precipitation, and the reaction can be expressed as ‘α-Mg′ → α-Mg + 14H’. Zn content had no obvious effect on the precipitation of β series. Aging conducted(T6 and T5 treatment) on both the Mg-6Gd-4Y alloy and the Mg-6Gd-4Y-1Zn alloy caused the formation of β" precipitates. The T6-aging Mg-6Gd-4Y-1Zn alloy exhibited high tensile strength combined with good ductility, and the values of the yield strength (YS), ultimate tensile strength (UTS) and elongation were 309MPa, 438MPa and 6.8%, respectively. It was due to the coexistence of 18R-LPSO phase and small dispersed distribution of the 14H-LPSO phase and the β" precipitates in the microstructure.
作者单位E-mail
甄睿 南京工程学院材料工程学院 20762129@qq.com 
孙扬善 东南大学 材料科学与工程学院  
沈学为 南京工程学院材料工程学院  
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