Effect of temperature and strain rate on compressive response of extruded magnesium nano-composite  

作　　者：B.Selvam P.Marimuthu R.Narayanasamy V.Senthilkumar K.S.Tun M.Gupta 

机构地区：[1]Department of Mechanical Engineering,Mookambigai College of Engineering,Pudukkottai,Tamilnadu 622502,India [2]Syed Ammal Engineering College,Ramanathapuram,Tamilnadu 623502,India [3]Department of Production Engineering,National Institute of Technology,Tiruchirappalli,Tamilnadu 620015,India [4]Department of Mechanical Engineering,National University of Singapore,9 Engineering Drive 1,Singapore 117576,Singapore

出　　处：《Journal of Magnesium and Alloys》2015年第3期224-230,共7页镁合金学报（英文）

摘　　要：The hot deformation behaviour of extruded magnesium-zinc oxide nano composite has been studied using hot compression test.The test was conducted in the temperature range of 250-400℃ and in the strain rate range of 0.01 to 1.5 s^(−1).The processing map was obtained using the power dissipation efficiency with the functions of temperature and strain rate.The workability and instability domains were observed in the processing map for a nano composite.The optical microscopy(OM),scanning electron microscopy(SEM)and transmission electron microscopy(TEM)images were used to confirm the formation of dynamic recrystallization(DRX),dynamic recovery(DRY)and instability regions.The workability region of the composite was identified at a working temperature of 400℃ and the strain rate of 0.01 s^(−1) from the processing map.The instability regions were observed at higher strain rates(>0.1 s^(−1))and temperatures(250-400℃).

关 键 词：Metal matrix composites Powder metallurgy Processing map Strain rate INSTABILITY NANO-COMPOSITE 

分 类 号：TG1[金属学及工艺—金属学]