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
期刊:
影响因子:
8.4
通讯作者:
Ruizhi Wu
Ruizhi Wu
中科院分区:
材料科学1区
文献类型:
--
作者:
Shujuan Liu;Li Zhang;Milin Zhang;Ruizhi Wu

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研究了从室温到 250 °C 的含有长周期堆垛有序 (LPSO) 相的挤压 Mg–6RY–4Zn 和 Mg–9RY–4Zn(RY:富 Y 混合稀土金属)合金的缺口拉伸行为。与光滑样品相比,LPSO 长条在缺口样品中的裂纹更为严重。两种合金的 UTS 值均高于 300 MPa,且缺口敏感性比 (NSR) 值均大于 1,因为 LPSO 相的严重裂纹会在缺口样品中消耗更多能量。此外,NSR值随着RY含量的增加或测试温度的升高而升高。 LPSO相的强化效果在高温下更加显着。缺口导致两种合金的断裂模式由韧性断裂转变为脆性断裂。设计复杂形状部件应同时考虑 Mg-Y-Zn 合金的 NSR 和塑性。
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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