ZAlSi7Mg经电熔剂净化后成分及力学性能的研究

Study on Composition and Mechanical Properties of ZAlSi7Mg After Electro-slag Refinement

依据正交实验研究了电熔剂净化法时渣剂种类、渣层厚度和电流强度对ZAlSi7Mg合金元素的影响,利用直读光谱仪和万能力学试验机测量了ZAlSi7Mg净化前后的化学成分及力学性能。研究发现,经电熔剂净化过的ZAlSi7Mg合金中,Si、Fe、Cu、Mn含量基本不变,Mg元素含量波动较明显;在净化过程中,各影响因素对合金元素含量的影响作用从大到小为电流大小,渣剂种类,渣层厚度;净化后的铝合金抗拉强度为286.8 MPa,同时伸长率也有一定程度地提高,均明显高于净化前的。

On the basis of orthogonal test,the effects of residue cleaning agent type,slag layer thickness and current strength on ZAlSi7Mg alloying elements during elec-flux process were studied.By direct-reading spectrometer and universal mechanical testing machine,the chemical composition and mechanical properties of ZAlSi7Mg alloy before and after purification were measured.The results show that,the content of Si,Fe,Cu and Mn in the electric flux purified ZAlSi7Mg alloy are essentially the same,the content of Mg changes obviously.In the purification process,the influencing factors on the alloying elements content are as follow： current size residue cleaning agent types slag layer thickness.The tensile strength of purified aluminum alloy reaches 286.8 MPa,and then the elongation also increases to some extent,which are significantly higher than pre-purification alloy.