摘要
利用光学显微镜(OM)和扫描电镜悬挂的EBSD背散射衍射实验观察并研究了ZK60镁合金铸轧条带在热压(350℃/0.1 s-1)及退火处理(退火温度分别为250,300,350和400℃,退火时间分别为100,1000,5000,10000和50000 s)条件下的微观结构组织与织构演变。利用动态再结晶理论分析了ZK60镁合金铸轧条带、条带经小应变变形和大应变变形条件下的微观结构演变机理,利用静态再结晶理论分析了试样在不同热处理条件下的组织变化。结果表明,铸扎条带在热压变形后基面织构由弱变强,滑移和孪生导致动态再结晶发生,随应变增加,出现剪切带,晶粒明显细化。退火后基面织构逐渐弱化,基面沿轧制方向发生倾转,材料发生了明显静态再结晶。
Using optical microscopy,scanning electron microscopy（SEM） and electron back scatter diffraction（EBSD）,microstructural evolution of twin-roll-cast（TRC） ZK60 magnesium alloy was examined during hot compression and annealing treatment.The microstructure of the twin-roll-cast alloy hot-compressed（HC） at low and high strain was studied by dynamic recrystallization theory,and microstructure of the TRC-HC alloy annealed at different temperatures was analyzed by static recrystallization theory.The results show that basal texture turns stronger,slip and twin result in dynamic recrystallization.Shear band occurs with the increases of strain.Grain size is refined under high strain.Basal texture becomes weaker and the basal poles are rotated towards the rolling direction after annealing,indicating that static recrystallization occurs.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2010年第6期95-101,共7页
Transactions of Materials and Heat Treatment
基金
山东省自然科学基金(Y2008F27
ZR2009FL003)
关键词
ZK60镁合金
铸轧条带
热压变形
静态再结晶
微观结构演变
退火
magnesium alloy ZK60
twin roll casting
hot compression
static recrystallization
microstructural evolution
annealing
