陈嫚丽,宁海青,王艳彬,等.镁合金ZK60-RE半固态坯的微观组织演变[J].精密成形工程,2011,3(1):33-38.
CHEN Man-li,NING Hai-qing,WANG Yan-bin,et al.Microstructure Evolution of Magnesium ZK60-RE Semi-solid Billets[J].Journal of Netshape Forming Engineering,2011,3(1):33-38. |
| 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 |
| 投稿时间：2010-10-14 修订日期：2011-01-10 |
| 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: |
| 作者 | 单位 | | 陈嫚丽 | 1.中国兵器工业第五九研究所, 重庆 400039
2.国防科技工业精密塑性成形技术研究应用中心, 重庆 400039 | | 宁海青 | 1.中国兵器工业第五九研究所, 重庆 400039
2.国防科技工业精密塑性成形技术研究应用中心, 重庆 400039 | | 王艳彬 | 1.中国兵器工业第五九研究所, 重庆 400039
2.国防科技工业精密塑性成形技术研究应用中心, 重庆 400039 | | 赵志翔 | 1.中国兵器工业第五九研究所, 重庆 400039
2.国防科技工业精密塑性成形技术研究应用中心, 重庆 400039 | | 王元庆 | 1.中国兵器工业第五九研究所, 重庆 400039
2.国防科技工业精密塑性成形技术研究应用中心, 重庆 400039 |
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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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