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Superplasticity at Intermediate Temperatures of ZK60 Magnesium Alloy Processed by Indirect Extrusion
Metals ( IF 2.9 ) Pub Date : 2021-04-09 , DOI: 10.3390/met11040606
César Palacios-Trujillo , José Victoria-Hernández , David Hernández-Silva , Dietmar Letzig , Marco A. García-Bernal

Magnesium alloys usually exhibit excellent superplasticity at high temperature. However, many Mg alloys have poor formation ability near room temperature. Therefore, preparation of Mg alloys with suitable microstructures to show low or intermediate temperature superplasticity is an important goal. In this work, the superplastic behavior at intermediate temperatures of a commercial ZK60 magnesium alloy processed by indirect extrusion was investigated. After extrusion, the alloy showed a refined and homogeneous microstructure with an average grain size of 4 ± 2 μm. Overall texture measurement indicated that the alloy showed a strong prismatic texture with the highest intensity oriented to pole ⟨101¯0⟩. A texture component 1¯21¯1 parallel to the extrusion direction was found; this type of texture is commonly observed in Mg alloys with rare earth additions. Tensile tests were performed at temperatures of 150, 200, and 250 °C at three strain rates of 10−2, 10−3, and 10−4 s−1. A very high ductility was found at 250 °C and 10−4 s−1, resulting in an elongation to failure of 464%. Based on calculations of the activation energy and on interpretation of the deformation mechanism map for magnesium alloys, it was concluded that grain boundary sliding (GBS) is the dominant deformation mechanism.

中文翻译:

ZK60镁合金间接挤压中温下的超塑性

镁合金通常在高温下表现出优异的超塑性。但是,许多镁合金在室温附近的形成能力较差。因此,制备具有合适的微结构以显示低温或中温超塑性的Mg合金是一个重要的目标。在这项工作中,研究了通过间接挤压加工的商用ZK60镁合金在中间温度下的超塑性行为。挤压后,合金显示出细化且均匀的微观结构,平均晶粒尺寸为4±2μm。总体织构测量表明,合金显示出很强的棱柱织构,且强度最高指向极点⟨。101个¯0⟩。纹理组件1个¯2个1个¯1个发现平行于挤压方向;这种类型的织构通常在添加稀土元素的镁合金中观察到。拉伸试验是在150,200的温度下进行,并以10三个应变率250℃ -2,10 -3,10 -4小号-1。发现在250°C和10 -4 s -1时具有非常高的延展性,导致断裂伸长率为464%。基于活化能的计算和镁合金变形机理图的解释,得出的结论是晶界滑动(GBS)是主要的变形机理。
更新日期:2021-04-09
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