等通道转角挤压对Mg-1Zn-1Mn合金显微组织及性能的影响
发布时间：2018-12-17 11:36
【摘要】：镁合金由于其低密度、高比强度和良好的电磁屏蔽效果等优点广泛应用于航空航天、汽车和电子通讯等领域。镁合金作为植入材料在医学应用领域也有着广阔的发展与应用前景,受到了人们越来越多的关注。镁合金的性能对其作为医用材料的应用至关重要。本文选用Zn和Mn作为合金化元素,通过正挤压和等通道转角挤压(简称ECAP)变形制备出不同状态的Mg-1Zn-1Mn合金,分析了正挤压态和不同道次下ECAP态合金的微观组织、力学性能和腐蚀性能的变化。得出以下主要结论:(1) ECAP可细化合金晶粒,改变第二相的大小和分布。正挤压态合金的平均晶粒尺寸为5.08μm,ECAP 1道次、2道次和4道次合金的平均晶粒尺寸分别为4.89、4.12和5.11 μm。ECAP变形后,合金中的第二相颗粒变得更加细小且弥散分布于基体上。(2)与正挤压态相比,ECAP变形处理后,合金的硬度值和抗拉强度降低了,但是伸长率得到了提升。合金的抗拉强度随着ECAP挤压道次的增加而下降,其中2道次合金的硬度值和伸长率最高。(3) ECAP 1道次合金的容抗弧半径和电荷转移电阻最大,腐蚀速率最低,具有最好的耐蚀性能。(4) Mg-1Zn-1Mn合金在37 ℃ SBF溶液中浸泡72 h后,腐蚀产物的主要成分是HA(Ca10(OH)2(PO4)6)、CaCO3和Mg(OH)2。在正挤压态和ECAP 1道次的合金中,腐蚀产物层比较致密;ECAP 2道次和4道次的合金的腐蚀产物层疏松多孔。
[Abstract]:Magnesium alloys are widely used in aerospace, automobile and electronic communication due to their advantages of low density, high specific strength and good electromagnetic shielding effect. Magnesium alloys as implant materials also have a broad development and application prospects in the field of medical applications, which has attracted more and more attention. The properties of magnesium alloys are very important for their application as medical materials. In this paper, Zn and Mn are selected as alloying elements to prepare Mg-1Zn-1Mn alloy with different states by positive extrusion and equal channel angular extrusion (ECAP). The microstructure of ECAP alloy under positive extrusion and different pass is analyzed. Changes in mechanical properties and corrosion properties. The main conclusions are as follows: (1) ECAP can refine the grain and change the size and distribution of the second phase. The average grain size of the extruded alloy is 5.08 渭 m ECAP 1 pass, and the average grain size of the 2-pass and 4-pass alloy is 4.89 渭 m.ECAP and 5.11 渭 m.ECAP, respectively. The second phase particles in the alloy became smaller and dispersed on the matrix. (2) compared with the positive extrusion, the hardness and tensile strength of the alloy decreased after ECAP treatment, but the elongation was increased. The tensile strength of the alloy decreases with the increase of ECAP extrusion pass, in which the hardness and elongation of the second pass alloy are the highest. (3) the capacitance arc radius and charge transfer resistance of the ECAP 1 pass alloy are the largest, and the corrosion rate is the lowest. (4) after immersion in 37 鈩，
本文编号：2384141
[Abstract]:Magnesium alloys are widely used in aerospace, automobile and electronic communication due to their advantages of low density, high specific strength and good electromagnetic shielding effect. Magnesium alloys as implant materials also have a broad development and application prospects in the field of medical applications, which has attracted more and more attention. The properties of magnesium alloys are very important for their application as medical materials. In this paper, Zn and Mn are selected as alloying elements to prepare Mg-1Zn-1Mn alloy with different states by positive extrusion and equal channel angular extrusion (ECAP). The microstructure of ECAP alloy under positive extrusion and different pass is analyzed. Changes in mechanical properties and corrosion properties. The main conclusions are as follows: (1) ECAP can refine the grain and change the size and distribution of the second phase. The average grain size of the extruded alloy is 5.08 渭 m ECAP 1 pass, and the average grain size of the 2-pass and 4-pass alloy is 4.89 渭 m.ECAP and 5.11 渭 m.ECAP, respectively. The second phase particles in the alloy became smaller and dispersed on the matrix. (2) compared with the positive extrusion, the hardness and tensile strength of the alloy decreased after ECAP treatment, but the elongation was increased. The tensile strength of the alloy decreases with the increase of ECAP extrusion pass, in which the hardness and elongation of the second pass alloy are the highest. (3) the capacitance arc radius and charge transfer resistance of the ECAP 1 pass alloy are the largest, and the corrosion rate is the lowest. (4) after immersion in 37 鈩，
本文编号：2384141
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