Notch tensile behavior of extruded Mg–Y–Zn alloys containing long period stacking ordered phase
Notch tensile behavior of extruded Mg–Y–Zn alloys containing long period stacking ordered phase
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长周期堆垛有序相Mg-Y-Zn挤压合金的缺口拉伸行为
DOI:
10.1016/j.matdes.2013.11.035
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发表时间:
2014-04
影响因子:
8.4
通讯作者:
Ruizhi Wu
中科院分区:
文献类型:
--
作者:
Shujuan Liu;Li Zhang;Milin Zhang;Ruizhi Wu
The notch tensile behavior of extruded Mg–6RY–4Zn and Mg–9RY–4Zn (RY: Y-rich misch metal) alloys containing long period stacking ordered (LPSO) phase tested from room temperature to 250 °C was investigated. LPSO long-strips crack more severely in notch samples compared with that in smooth samples. The UTS values are above 300 MPa and the notch sensitivity ratio (NSR) values are larger than 1 in both alloys because the severe crack of LPSO phase costs more energy in notch samples. Furthermore, the NSR value rises with increasing the RY content or elevating the test temperature. The strengthening effect of LPSO phase is more remarkable at high temperatures. The notch leads the fracture mode of the two alloys changing from ductile fracture to brittle fracture. Designing complex shape components should consider the NSR and plasticity of Mg–Y–Zn alloys together.
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