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大家知道,使用水冷铜模铸造,可以得到异乎寻常的冷却速度,大约为10~3℃/秒,熔铝极快地凝固,使得Zr在Al中的固溶度,可能大大地超过平衡状态的数值,而达到1%左右。快速凝固的Al—1%Zr合金沉淀硬化的特征,在350—450℃人工时效可以显示出来。这种最佳的沉淀温度显然高于铝合金常用的工业时效硬化温度。另方面,Al—Zn—Mg合金是7000系工业铝合金的基础,它有一定的时效硬化性能,有适合于Zr沉淀的固溶温度。在本研究中,我们企图利用上述两种合金不同的时效温度,即通过Zr对Al—Zn—
As you know, using water-cooled copper mold casting, you can get an extraordinary cooling rate of about 10 ~ 3 ℃ / sec, the aluminum solidified very quickly, so that the solid solubility of Zr in Al, may greatly exceed the equilibrium Value, which reached about 1%. The characteristics of precipitation hardening of rapidly solidified Al-1% Zr alloys can be shown by artificial aging at 350-450 ° C. This optimum precipitation temperature is obviously higher than the commercial age hardening temperature commonly used in aluminum alloys. On the other hand, Al-Zn-Mg alloy is the base of 7000 series industrial aluminum alloy, it has some age hardening properties, suitable for Zr precipitation solid solution temperature. In this study, we attempted to make use of the different aging temperatures of the two alloys described above, ie, Zr through Al-Zn-