本文采用冷却曲线热分析法和连续扭矩测试技术对AZ6x（x=0~6）合金系列的泥区特性进行了表征及分析。结果表明：随着锌含量的增加，AZ6x合金初晶形核第一特征温度Tn1、初晶形核第二特征温度Tn2以及枝晶闭合温度Tch均逐步降低，（Tn1-Tn2）温差逐渐增加，（Tn2-Tch）温差变化不大；AZ6x合金的枝晶闭合固相分数fs-ch约为0.27~0.35，AM60和AZ66合金的fs-ch稍高，锌含量2~5wt%合金的fs-ch稍低，AZ62合金的fs-ch最低；随着锌含量的增加，AZ6x合金的枝晶硬化温度Tpk逐渐降低，Tpk处的固相分数逐渐降低，Tpk处的泥区强度值先升后降，锌含量2~5wt%合金的泥区强度增长速度相对缓慢；冷却曲线热分析法和连续扭矩测试技术的结果具有可比性。
Mushy zone properties of AZ6x alloys were characterized and analysed by using cooling curve thermal analysis method and continuous torque measurement technique. The results show that Tn1 (first characteristic temperature of primary crystal nucleation), Tn2 (second characteristic temperature of primary crystal nucleation) and Tch (temperature of dendritic coherency) decrease with the increasing of zinc content, and the temperature difference of (Tn1-Tn2) grows slowly while the temperature difference of (Tn2-Tch) almost remains constant; The results also show that the fs-cc (solid fraction of dendritic coherency) of AZ6x alloys is about 0.27~0.35 while AM60 and AZ66 alloys having higher fs-ch and alloys with 2~5wt% zinc content having lower fs-ch and AZ62 alloy having the lowest fs-ch; The results also show that Tpk (temperature of dendritic packing) decrease with the increasing of zinc content, and the solid fraction at Tpk decreases with the increasing of zinc content, and the mushy zone strength at Tpk increases first and then decreases with the increasing of zinc content while mushy zone strength of alloys with 2~5wt% zinc content having relatively slow increasing speed. the results obtained by cooling curve thermal analysis method and continuous torque measurement technique are accordant to each other.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%