文章摘要
镁合金ZK60-RE半固态坯的微观组织演变
Microstructure Evolution of Magnesium ZK60-RE Semi-solid Billets
Received:October 14, 2010  Revised:January 10, 2011
DOI：
中文关键词: 微观组织  传统铸造  等径道角挤压  镁合金ZK60-RE
英文关键词: microstructure  conventional casting  equal channel angular extrusion  magnesium ZK60-RE
基金项目:
Author NameAffiliation
CHEN Man-li 1.No.59 Institute of China Ordnance Industry， Chongqing 400039， China
2.National Defence Research and Application Center of Precision Plastic Forming Technology， Chongqing 400039， China 
NING Hai-qing 1.No.59 Institute of China Ordnance Industry， Chongqing 400039， China
2.National Defence Research and Application Center of Precision Plastic Forming Technology， Chongqing 400039， China 
WANG Yan-bin 1.No.59 Institute of China Ordnance Industry， Chongqing 400039， China
2.National Defence Research and Application Center of Precision Plastic Forming Technology， Chongqing 400039， China 
ZHAO Zhi-xiang 1.No.59 Institute of China Ordnance Industry， Chongqing 400039， China
2.National Defence Research and Application Center of Precision Plastic Forming Technology， Chongqing 400039， China 
WANG Yuan-qing 1.No.59 Institute of China Ordnance Industry， Chongqing 400039， China
2.National Defence Research and Application Center of Precision Plastic Forming Technology， Chongqing 400039， China 
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中文摘要:
      采用常规铸造法和等径道角挤压分别制备了镁合金ZK60-RE半固态坯；用金相显微镜研究了2种半固态坯料在等温热处理过程中的微观组织演变。结果表明：与传统铸造方法制备的半固态坯相比，采用等径道角挤压制备的半固态坯的晶粒细小、圆整，适合于半固态成形。在等温热处理过程中，2种坯料晶粒粗化的机制是合并长大和Ostwald长大。铸态坯料晶粒液相来源于非平衡凝固时在晶内产生的共晶组织，以及在随后的合并长大过程中晶粒所包裹的液相。随着保温时间的延长，铸态坯料的晶粒尺寸变化情况是：增大、减小然后又增大；而挤压态坯料的晶粒尺寸呈单一增大趋势。
英文摘要:
      Magnesium ZK60-RE semi-solid billets were prepared by conventional cast and equal channel angular extrusion respectively. Microstructure evolution of as-cast and extruded semi-solid billets during isothermal heat treatment was studied by optical microscope. The results show that in comparison with grains of semi-solid billets prepared by conventional casting, those of semi-solid billets prepared by equal channel angular extrusion are more fine and spherical and better suited for semi-solid forming. During isothermal heat treatment, the grain coarsening mechanisms of two billets are coalescence and Ostwald ripening. The intragranular liquid droplets in grains for as-cast materials originate from eutectic structure during non-equilibrium freezing and entrapped liquid during coalescence of grains. With increasing in holding time, the grain size of the as-cast billets increases initially, then decreases and increases again, while the grain size of the extruded billets increase monotonously.
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