Effect of Si on the Interaction between Die  Casting Die and Aluminum Alloy

Zhu Hanliang  Guo Jinjie  Jia Jun

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Effect of Si on the Interaction between Die Casting Die and Aluminum Alloy
Issue 6, (1998)
Published： 1998 ，
DOI：

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[1]祝汉良,郭景杰,贾均.硅对压铸模与铝合金相互作用的影响[J].特种铸造及有色合金,1998(06):24-27.

Zhu Hanliang Guo Jinjie Jia Jun. Effect of Si on the Interaction between Die Casting Die and Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys (6).(1998)
[1]祝汉良,郭景杰,贾均.硅对压铸模与铝合金相互作用的影响[J].特种铸造及有色合金,1998(06):24-27. DOI：

Zhu Hanliang Guo Jinjie Jia Jun. Effect of Si on the Interaction between Die Casting Die and Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys (6).(1998) DOI：

摘要

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Ｆｅ２Ａｌ５相层和针片状的ＦｅＡｌ３相，Ｆｅ２Ａｌ５相是反应扩散的主导相。模具钢在Ａ３８０合金中热浸时，主要形成ＦｅＳｉＡｌ３和Ｆｅ２Ａｌ５两种相层。由于Ｓｉ降低了Ａｌ在ＦｅＳｉＡｌ３相层中的活度，减少了从铝熔体向Ｆｅ２Ａｌ５相供应的铝原子数，从而抑制了Ｆｅ２Ａｌ５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Ｆｅ２Ａｌ５相层生长的抑制作用减弱。

Abstract

The experiment of hot dip aluminizing had been carried out in order to study the interaction between die casting die and aluminum alloy and the effect of Si on soldering tendency between die and aluminum alloy casting. The experimental results show that Fe 2Al 5 phase layer and FeAl 3 phase are formed when samples of die steel are dipped in pure Al melt

and Fe 2Al 5 phase is the predominant phase of reaction diffusion. Two phase layers of FeSiAl 3 and Fe 2Al 5 are formed when samples are dipped in A380 melt. Because the existence of Si reduces the activity coefficient of Al in the phase layer of FeSiAl 3 and decreases the number of aluminum atoms

supplied from molten Al to Fe 2Al 5 phase

the fast growth of Fe 2Al 5 phase is restrained. Therefore

the element Si in aluminum alloy reduces the interaction between die steel and aluminum alloy melt and reduces the soldering tendency of aluminum die casting. The restraining effect of Si on the Fe 2l 3 phase layer growth decreases with temperature decreasing of hot dip aluminizing.