锻压技术

挤锻复合成形AZ80镁合金的组织与冲击性能研究

英文标题：Investigation on microstructure and impact properties of magnesium alloy

作者：吴思俊张宇

单位：浙江工业职业技术学院

分类号：TG249.2

出版年,卷(期):页码：2018,43(8):173-77

摘要：

采用不同的工艺参数对AZ80镁合金进行了挤锻复合成形，研究了挤压温度、锻压温度对合金显微组织和冲击性能的影响。试验结果表明：随挤压温度、锻压温度增加，AZ80镁合金的平均晶粒尺寸均先减小后增大，冲击韧度均先增大后减小。当挤压温度和锻压温度均为390 ℃时，AZ80镁合金的平均晶粒尺寸最小，晶粒得到显著细化，冲击韧度最大，韧性最佳，冲击性能最好。挤压温度和锻压温度的升高能够激活和协调镁合金的棱柱滑移系，减小变形的阻力，进而提升镁合金内部组织的塑性变形。挤锻复合成形有利于AZ80镁合金的塑性变形，晶粒的细化和均匀化分布使得裂纹难以产生，而且第二相的分布状态也使得裂纹难以蔓延，因此经挤压后的镁合金韧性较佳。当挤压温度或锻压温度继续上升至420 ℃后，镁合金内部的强化相晶粒反而增大，冲击韧度变小，冲击性能下降。

The extrusion-forging compound forming of magnesium alloy AZ80 was conducted by different process parameters,
and the influences of extrusion temperature and forging temperature on the microstructure and impact properties of
alloy were studied. The experimental results show that the average grain size of magnesium alloy AZ80 decreases first and then increases and the impact toughness increases first and then decreases with the increasing of extrusion temperature and forging temperature. When the extrusion temperature and forging temperature are 390 ℃, the average grain size of magnesium alloy AZ80 is the smallest and the impact toughness is the highest, so the grain is significantly refined and the best toughness and impact performance are obtained. Therefore,the increase of extrusion temperature and forging temperature can activate and coordinate the prismatic slip system of magnesium alloy to reduce the resistance of deformation, and then the plastic deformation of the internal structure of magnesium alloy is enhanced. The extrusion-forging compound forming is beneficial to the plastic deformation of magnesium alloy AZ80, the grain refinement and homogenization distribution are difficult to produce the crack, and the distribution of the second phase is also difficult to propagate the crack. Thus, the toughness of the extruded magnesium alloy becomes better. When the extrusion temperature or forging temperature rise to 420 ℃ continually, the size of reinforcement grain inside the magnesium alloy increases, the impact toughness decreases, and the impact properties decrease.

基金项目：

浙江省公益技术应用研究计划项目(2017C31039)

吴思俊（1976-），男，硕士，讲师 E-mail：niceyunwu@sina.com

参考文献：

［1］张晓旭，杜子学. 等通道角轧制对汽车车身用轻质镁合金板微观组织与力学性能的影响
［J］. 锻压技术，2017，42（3）：154-158.

Zhang X X，Du Z X. Influence of equal channel angular rolling on microstructure and mechanical properties of magnesium alloy AZ31 sheet
［J］. Forging & Stamping Technology，2017，42（3）：154-158.

［2］张广俊.AZ61镁合金在挤锻复合成型过程中的组织性能观察
［D］.重庆:重庆大学,2009.

Zhang G J. Observation for Microstructure and Properties of AZ61 Magnesium Alloy During Extruding-forging Compound Forming Process
［D］. Chongqing:Chongqing University，2009.

［3］李亚宁,龙思远,曹韩学,等.AZ61镁合金挤锻复合成形技术研究
［J］.特种铸造及有色合金,2009,29(4):384-387.

Li Y N，Long S Y，Cao H X，et al. Extrusion and forging combined forming of magnesium alloy AZ61
［J］. Special Casting & Nonferrous Alloys，2009，29(4):384-387.

［4］李凡波，周海涛，秦径为，等.AZ80镁合金流变应力预测及动态再结晶动力学
［J］.塑性工程学报，2016，23（1）：104-111.

Li F B,Zhou H T,Qin J W,et al. Flow stress prediction and dynamic recrystallzation kinetics of AZ80 magnesium alloy
［J］.Journal of Plasticity Engineering, 2016，23（1）：104-111.

［5］徐绍勇,龙思远,曹凤红,等.热处理对挤锻复合成形AZ61镁合金组织与性能的影响
［J］.热加工工艺,2010,39(24):199-203.

Xu S Y, Long S Y, Cao F H，et al. Influence of heat treatment on microstructure and mechanical property of extrusion-forging AZ61 alloy
［J］. Hot Working Technology，2010，39 (24):199-203.

［6］杜勇,龙思远,曹凤红,等.挤锻复合成形工艺对AZ81镁合金组织和性能的影响
［J］.特种铸造及有色合金,2009,29(1):39-41.

Du Y, Long S Y, Cao F H，et al. Effects of extruding-forging process on microstructure and properties of AZ81 magnesium alloy
［J］. Special Casting & Nonferrous Alloys，2009，29(1):39-41.

［7］郭强,严红革,陈振华,等.多向锻造工艺对AZ80镁合金显微组织和力学性能的影响
［J］.金属学报,2006,42(7):739-744.

Guo Q,Yan H G, Chen Z H, et al. Effect of multiple forging process on microstructure and mechanical properties of magnesium alloy AZ80
［J］. Acta Metallurgical Sinica，2006，42(7):739-744.

［8］曹凤红,龙思远,杜勇,等.AZ61镁合金挤锻复合成形组织与力学性能
［J］.材料热处理学报,2009,30(5):154-157.

Cao F H，Long S Y, Du Y, et al. Microstructure and tensile properties of AZ61 magnesium alloy subjected to an extrusion-forging compound processing
［J］. Transactions of Materials and Heat Treatment,2009，30(5):154-157.

［9］李慧中,卫晓燕,欧阳杰,等.挤压态AZ80镁合金的热变形行为
［J］.中国有色金属学报：英文版,2013,(11):3180-3185.

Li H Z, Wei X Y, Ouyang J, et al. Hot deformation behavior of extruded AZ80 magnesium alloy
［J］. Transactions of Nonferrous Metals Society of China，2013，(11):3180-3185.

［10］曹凤红,龙思远.时效处理对AZ81镁合金组织与力学性能的影响
［J］.热加工工艺,2010,39(8):159-162,167.

Cao F H，Long S Y. Influence of aging treatment on microstructure and mechanical properties of AZ81 alloy
［J］. Hot Working Technology，2010，39(8):159-162,167.

服务与反馈：

【文章下载】【加入收藏】