合金结晶温度区间对铝液密度检测的影响

Influences of Crystallization Temperature Range on Density Detection of Liquid Aluminum

对不同结晶温度区间的铝合金进行了密度检测,分析了结晶温度区间对合金凝固方式的影响。通过试验结果和理论分析发现,结晶温度区间较宽的合金,易形成较大的成分过冷区间,在固-液两相区内形成较多的固相骨架,凝固时析出的气泡被抽出的较少,铝液含气量与密度的对应关系较好;而结晶温度区间较小的合金,在密度测试量杯中以逐层凝固方式凝固,凝固时析出的气泡被抽出的较多,铝液含气量与密度的对应关系较差。

The density of aluminum alloy with different crystallization temperature range was measured,and the influence of crystallization temperature range on solidification mode of alloy was analyzed.Through the test and theoretical analysis,the results show that alloy crystallization temperature with a wide range is easy to form a larger constitutional supercooling range,and the more solid skeleton in mushy zone can be formed,meanwhile,less bubbles are drawn out during solidification and corresponding relationship between gas content and density of aluminum liquid is more desirable.Alloy with a small range of crystallization temperature is solidified in form of layer by layer solidification in the measuring cup of density testing and more bubbles are drawn out during solidification.In addition,the corresponding relationship between gas content and density of aluminum liquid is poor.