Microstructure and Properties of Al-10Zn Alloy with Different Er Contents AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY23120021

Chinese Library Classification Number:TG113.1

Citation Information:

Al-Zn alloy has been widely used because of its advantages of high strength，good casting performance，simple process and low production cost，but it also has some problems such as unstable size and mechanical properties，poor plasticity and low strength at high temperature. Rare earth Er，as a kind of trace element with relatively low price and significant influence on the microstructure properties of alloys，has been widely concerned. It is found that the strengthening effect of Er in aluminum alloy is related to its content. When 0.2%~0.4% Er is added to aluminum alloy，some of Er will form （α（Al）+Al₃Er） intermetallic compounds in grain boundary segregation except for a small amount of Er dissolved in the matrix，and the rest will form fine primary Al₃Er phase dispersed in the matrix. The grain refinement of the alloy is obvious，and the high temperature plasticity，thermal stability and strength of the alloy are improved. However，there are few reports on the effects of Er content on the mechanical and thermal properties of Al-Zn alloy，and the change law of the microstructure of Al-Zn alloy with the increase of Er content and the Er content corresponding to the optimal performance have not been clearly obtained. It is of great significance to analyze the microstructure，mechanical and thermal properties of Al-Zn alloys with different Er contents. The microstructure and element distribution of Al-10Zn-xEr alloys with different Er contents were analyzed by electron probe X-ray microanalysis （EPMA） and energy dispersive spectrometer （EDS）. The micro-Vickers hardness of the alloy was determined，the density of the alloy was measured by the drainage method，the specific heat capacity of Al-10Zn-xEr alloys at different temperatures was analyzed by differential scanning calorimetry （DSC），and the phase transition temperature of the alloy was analyzed. The thermal diffusion coefficient of the alloy at different temperatures was determined by laser flash apparatus （LFA），and the thermal conductivity of the alloy was calculated according to the density，specific heat capacity and thermal diffusion coefficient of the alloy. The results showed that Er could refine the microstructure of Al-10Zn alloy，and the grain refining effect was most obvious when Er content was 0.4%. With the further increase of Er content，the second phase accumulated in large quantities at the grain boundaries. Zn existed mainly in the form of Al-Zn solid solution，and Er existed in the form of intermetallic compound Al₃Er. Er element could fine the microstructure of the alloy，and the rare earth Er was dispersed in the grain boundary，which effectively hindered the deformation of the matrix and the movement of the grain boundary，thus improving the hardness and tensile strength of the alloy. When Er content was 0.4%，the refining effect was obvious，Vickers hardness and tensile strength of the alloy reached the maximum value，which were HV 61.32 and 135.3 MPa，respectively. The correlation coefficient （r） between Vickers hardness and tensile strength was 0.96，showing a significant linear relationship. DSC analysis showed that with the increase of Er content，DSC temperature curve of the alloy appeared a small step，the solid-liquid phase transition temperature increased first and then decreased，and reached the highest of 640.4 ℃ when the content was 0.4%. In the range of 100~500 ℃，the specific heat capacity and thermal diffusion coefficient of the alloy with Er content of 0.4% were the minimum values of Al-10Zn-xEr alloys. With the increase of Er content in Al-10Zn alloy，Al₃Er intermediate phase in the alloy increased，and the electron waves were scattered by different phase interfaces，so that the thermal conductivity of the alloy decreased as a whole with the increase of temperature. When Er content was 0.4%，the thermal conductivity of the alloy decreased most significantly with the temperature.