Microstructure, mechanical and damping properties of Mg-Er-Gd-Zn alloy reinforced with stacking faults

Microstructure, mechanical and damping properties of Mg-Er-Gd-Zn alloy reinforced with stacking faults
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堆垛层错强化Mg-Er-Gd-Zn合金的显微组织、力学及阻尼性能

DOI:
10.1016/j.matdes.2015.04.037
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发表时间:
2015-08
期刊:
影响因子:
8.4
通讯作者:
Wu, Ruizhi
Wu, Ruizhi
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhang, Li;Jiang, Fengchun;Zhang, Milin;Wu, Ruizhi

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采用直冷半连续铸造-热处理-热挤压工艺制备了新型Mg-4 Er-4Gd-1 Zn合金。该合金具有良好的室温力学性能,这是由于形成了丰富的纳米间距的基面堆垛层错(SF)。抗拉强度(UTS)、屈服强度(TYS)和延伸率分别为358 MPa、253 MPa和20%。与Mg-8 Er合金相比,添加SFs后的Mg-4 Er-4Gd-1 Zn合金具有更好的阻尼性能。传统的G-L理论不能概括含SFs的Mg-4 Er-4Gd-1 Zn合金的阻尼机理。探讨了SFs对力学性能和阻尼性能的影响,为开发高阻尼、高力学性能的镁合金提供了新的思路。
A novel Mg–4Er–4Gd–1Zn alloy was prepared by combined processes of direct-chill semi-continuous casting, heat-treatment and hot-extrusion. The alloy has good mechanical properties at room temperature due to the formation of profuse nano-spaced basal plane stacking faults (SFs). The ultimate tensile strength (UTS), tensile yield strength (TYS) and elongation are 358 MPa, 253 MPa and 20%, respectively. The Mg–4Er–4Gd–1Zn alloy with SFs also obtains better damping capacity compared with Mg–8Er alloy. The damping mechanism of Mg–4Er–4Gd–1Zn alloy with SFs cannot be generally included in traditional G–L theory. Influences of SFs to mechanical properties and damping capacity have been discussed, which may provide a new perspective for developing magnesium alloys with both high damping and mechanical properties.
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