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使用俄歇电子光谱仪对合金添加剂在新淬火,未充分时效、峰值时效和过时效状态的三元Al—5.5％Zn—2.5％Mg合金晶界处的含量分布情况进行了测量。AES深度分布图示出了Mg和Zn在晶界处的明显偏析,它与以前对相同合金的测量结果完全不同。还发现,这种明显的矛盾,可通过AES光谱的等离子损失特点来阐明晶界偏析情况面得到解决。用AES等离子损耗测量方法,即可测定Mg和Zn在晶界处的偏析,又能测定合金添加剂周围的冶金环境。还指出,过时效的Al合金试样,仅有部分Mg(占晶界处总Mg含量的一部分)进入了MgZn_2沉淀相,余者则集中分布在界面处的几个原子层内。
The Auger electron spectrometer was used to measure the content distribution of the alloy additives in the boundaries of the ternary Al-5.5% Zn-2.5% Mg alloy with newly quenched, under-aged, aged and overaged states. The AES depth profile shows a clear segregation of Mg and Zn at the grain boundaries, which is completely different from the previous measurements on the same alloy. It has also been found that this apparent contradiction can be explained by the plasma loss characteristics of the AES spectrum to clarify the situation of grain boundary segregation. With the AES plasma loss measurement method, the segregation of Mg and Zn at the grain boundaries can be measured, and the metallurgical environment around the alloy additives can be measured. It is also pointed out that only part of Mg (part of the total Mg content at the grain boundary) enters the MgZn 2 precipitated phase and the rest are concentrated in several atomic layers at the interface.