Maintaining High Strength in Mg-LPSO Alloys with Low Yttrium Content Using Severe Plastic Deformation.

Maintaining High Strength in Mg-LPSO Alloys with Low Yttrium Content Using Severe Plastic Deformation.
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DOI:
10.3390/ma11050733
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发表时间:
2018-05-05
期刊:
Materials (Basel, Switzerland)
影响因子:
--
通讯作者:
Adeva P
Adeva P
中科院分区:
其他
文献类型:
--
作者:
Garces G;Cabeza S;Barea R;Pérez P;Adeva P

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替代的加工路线,如粉末冶金,挤压回收芯片,或等通道角挤压(ECAP)已被认为是保持高机械强度的Mg-Y-Zn合金的有效方法,相对于通过常规挤压的铸态锭加工的合金,具有最小化钇含量的优点,含有长周期堆叠有序结构。由于ECAP加工引起的晶粒细化,仅用通常的钇和锌添加剂的一半就可以获得与挤压Mg 97 Y2 Zn 1合金相似的屈服应力。Mg98.5Y1Zn0.5的ECAP性能在200 °C时仍能保持,但在此温度以上,通过粉末冶金工艺处理该合金时,发现超塑性行为。
Alternative processing routes such as powder metallurgy, the extrusion of recycled chips, or equal channel angular pressing (ECAP) have been considered for effective methods of maintaining the high mechanical strength of Mg-Y-Zn alloys containing long-period stacking ordered structures with respect to the alloy processed by the conventional extrusion of as-cast ingots with the advantage of minimizing the yttrium content. A yield stress similar to that found for extruded Mg97Y2Zn1 alloy can be attained with only half of the usual yttrium and zinc additions thanks to the grain refinement induced by ECAP processing. The properties of Mg98.5Y1Zn0.5 subjected to ECAP are maintained up to 200 °C, but superplastic behavior is found above this temperature when the alloy is processed through a powder metallurgy route.
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