摘要
为了在挤压生产中获取均匀的镁合金变形组织,需要掌握合金含量及均匀化退火对热挤压组织的影响规律。本实验通过在Gleeble-1500D热模拟实验机上对不同Al含量的AZ10,AZ31,AZ61和AZ91镁合金进行热模拟挤压,结果表明,经过400℃/12h均匀化退火,AZ10和AZ31合金均形成单一的α固溶体,AZ61合金中有细小的β-Mg17Al12相弥散分布于晶内,AZ91合金的晶界和晶内都有较大尺寸的第二相颗粒存在;经挤压比20.3挤压温度390℃热挤压,挤压前经均匀化的变形合金晶粒尺寸较大,未经均匀化的变形合金存在未变形条纹,组织均匀性差,但已发生了再结晶的晶粒较细小。
In order to get extruded magnesium alloy with uniform microstructure,it is important to understand the effects of the content of alloying element and the homogenization annealing on the deformed microstructure.The AZ10,AZ31,AZ61 and AZ91 magnesium alloys were deformed with simulated extrusion system on Gleeble-1500D simulator.The results show that with homogenization annealing of 400℃/12h,the AZ10 and AZ31 alloys are in single solid solution phase,the AZ61 alloy has fine β phase particles inside the grain,while the AZ91 alloy has coarse β phases both inside the grains and on the grain boundary.After the extrusion with temperature of 390℃ and extrusion ratio of 20.3,the extruded alloy with homogenization annealing before extrusion has more uniform grains in size,while the extruded alloy without previously homogenization annealing has non-uniform structure consisting deformed strips and fine grains.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2011年第6期17-22,共6页
Journal of Materials Engineering
基金
国家重点基础研究发展规划项目(973计划)(2007CB613702)
重庆市科委科技计划攻关重点项目(CSTC2009AB4134)
重庆市科委自然科学基金(CSTS2010BB4068)
关键词
镁合金
均匀化退火
挤压
显微组织
均匀性
magnesium alloy
homogenization annealing
extrusion
microstructure
uniformity
