Fe含量对亚共晶Al-Ni合金微观组织、热导率和力学性能的影响OACSTPCD
Effect of Fe Contents on Microstructure,Thermal Conductivity and Mechanical Properties of Hypoeutectic Al-Ni Alloy
研究了不同Fe含量对亚共晶Al-4Ni合金微观组织、热导率以及力学性能的影响.结果表明,当不存在Fe时,合金中的微观组织主要是初生α-Al和(α-Al+Al3Ni)共晶组织.随着Fe元素增加至0.5%,初生相仍为α-Al,共晶组织变为(α-Al+Al3Ni)二元共晶和(α-Al+Al3Ni+Al9NiFe)三元共晶.当Fe含量超过0.75%,初生相为Al9NiFe,同时形成halo铝枝晶,共晶组织变为(α-Al+Al9NiFe)二元共晶和(α-Al+Al3Ni+Al9NiFe)三元共晶.随着Fe元素的加入,Al-4Ni-xFe合金的热导率呈下降趋势,这主要与合金α-Al基体中Fe原子的固溶量和Al9NiFe相的含量和形貌相关.在力学性能方面,随着Fe的增加,Al-4Ni-xFe的屈服强度不断增加,伸长率先缓慢下降再急剧下降,这主要是由于合金中形成了Al9NiFe初生相,加速了裂纹的扩展.综合考虑,Al-4Ni-0.5Fe合金的热导率和力学性能取得了较好的权衡,具有最佳的综合性能.
Al-Ni alloy is a widely used high-pressure die-cast aluminum alloy system for high thermal conductivity applications,and the influence of Fe content on the thermal conductivity of Al-Ni alloy is very important.In this paper,the effect of different Fe contents on microstructure,thermal conductivity and mechanical properties of hypoeutectic Al-4Ni alloys were studied.The results showed that the microstructure inAl-4Ni alloy was primary α-Al and(α-Al+Al3Ni)eutectic.As the Fe content increased to 0.5%,the eutectic microstructure became(α-Al+Al3Ni)binary eutectic and(α-Al+Al3Ni+Al9NiFe)ternary eutectic.When the Fe content exceeded 0.75%,the primary Al9NiFe phase and halo aluminum dendrite were formed,and the eutectic microstructure became(α-Al+Al9NiFe)binary eutectic and(α-Al+Al3Ni+Al9NiFe)ternary eutectic.With the addition of Fe,thermal conductivity of Al-4Ni-xFe alloy declined,which was mainly related to the solubility of iron in the α-Al matrix of the alloy and the content and morphology of the A19NiFephase.In terms of mechanical properties,with the increase of Fe,yield strength of Al-4Ni-xFe increased,and the elongation slowly decreased first and then dropped sharply.This was mainly due to the formation of A19NiFe primary phase in the alloy,which accelerated the crack propagation.Above all,Al-4Ni-0.5Fe alloy with a good trade-off on thermal conductivity and mechanical properties had the best comprehensive property.
刘亦贤;熊守美;刘永昌;万翱翔;王鹏展;Saria Akhtar;葛素静;霍臣明;苑高利;张祎程
清华大学材料学院,北京 100084清华大学材料学院,北京 100084||先进成形制造教育部重点实验室,北京 100084河北新立中有色金属集团有限公司,河北保定 071100||河北省轻金属合金材料技术创新中心,河北保定 071100河北省轻金属合金材料技术创新中心,河北保定 071100||先进成形制造教育部重点实验室,北京 100084
金属材料
Al-Ni合金Fe元素微观组织热导率力学性能
Al-Ni alloyironmicrostructurethermal conductivitymechanical properties
《铸造》 2024 (003)
282-289 / 8
国家自然科学基金面上项目(52175335).
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