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为了研究压铸模与铝合金的相互作用 ,探讨Si对压铸模与铝铸件焊合倾向性的影响 ,进行了热浸铝试验。试验结果表明 ,模具钢在纯铝熔体中热浸时 ,主要形成Fe2 Al5相层和针片状的FeAl3 相 ,Fe2 Al5相是反应扩散的主导相。模具钢在A3 80合金中热浸时 ,主要形成FeSiAl3 和Fe2 Al5两种相层。由于Si降低了Al在FeSiAl3 相层中的活度 ,减少了从铝熔体向Fe2 Al5相供应的铝原子数 ,从而抑制了Fe2 Al5相的快速生长。因而 ,Si减弱了铝合金熔体与模具钢间的相互作用 ,从而降低压铸合金的焊合倾向性。热浸温度降低 ,Si对Fe2 Al5相层生长的抑制作用减弱
In order to study the interaction between die-casting mold and aluminum alloy, the effect of Si on the welding tendencies between die-casting mold and aluminum casting was investigated, and the hot-dip aluminum test was carried out. The experimental results show that the main phase of Fe2Al5 phase and needle-shaped FeAl3 phase are formed when hot-dip of die steel in pure aluminum melt, and Fe2Al5 phase is the dominant phase of reaction diffusion. When the die steel is hot-dipped in the A380 alloy, two phase layers of FeSiAl3 and Fe2Al5 are mainly formed. Since Si reduces the activity of Al in the FeSiAl3 phase and reduces the number of aluminum atoms supplied from the aluminum melt to the Fe2Al5 phase, the rapid growth of the Fe2Al5 phase is suppressed. Thus, Si weakens the interaction between the aluminum alloy melt and the mold steel, thereby reducing the tendency of the die-cast alloy to weld. The hot-dip temperature decreases and Si inhibits the growth of the Fe2Al5 layer