Abstract ADC12 die-casting precursors containing many gas pores were fabricated by the friction stir welding (FSW) route and were foamed by the FSW foaming process only using the friction heat during the indentation of the tool used for spot FSW. ADC12 precursors can be foamed by the friction heat generated during spot FSW without using TiH2 as a blowing agent. ADC12 foams can be obtained without using Al2O3 as a stabilization agent. This is considered to be due to impurities contained in the ADC12 die-castings. ADC12 foams with Al2O3 exhibited a larger expansion ratio than those without Al2O3. ADC12 foams with Al2O3 had significantly finer pores than those without Al2O3. The pore diameters of the ADC12 foams with Al2O3 were approximately half of those of the foams without Al2O3. This is considered to be due to the higher viscosity of the ADC12 substrate containing Al2O3.

中文翻译：

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无发泡稳定剂泡沫铝前驱体在搅拌摩擦焊过程中的发泡行为

摘要 含有大量气孔的ADC12压铸前驱体是通过搅拌摩擦焊（FSW）工艺制备的，并通过FSW发泡工艺仅利用用于现场FSW的工具压痕过程中的摩擦热发泡。在不使用 TiH2 作为发泡剂的情况下，ADC12 前体可以通过现场 FSW 期间产生的摩擦热发泡。无需使用 Al2O3 作为稳定剂即可获得 ADC12 泡沫。这被认为是由于 ADC12 压铸件中含有杂质。含Al2O3 的ADC12 泡沫比不含Al2O3 的泡沫表现出更大的膨胀率。含有 Al2O3 的 ADC12 泡沫比不含 Al2O3 的泡沫具有明显更细的孔隙。含有 Al2O3 的 ADC12 泡沫的孔径大约是不含 Al2O3 的泡沫的孔径的一半。