挤压铸造Al-5.0Cu-0.6Mn-1.0Fe-1.0Ni合金的高温力学性能

发布时间：2018-03-02 09:05

本文关键词： 铝铜合金挤压铸造高温力学性能　出处：《中国有色金属学报》2015年06期 　论文类型：期刊论文

【摘要】：采用拉伸性能测试、光学显微镜、扫描电镜、透射电镜、电子探针、X射线衍射等研究了T7热处理态的挤压铸造Al-5.0Cu-0.6Mn-1.0Fe-1.0Ni合金的显微组织及力学性能,重点研究了挤压压力对合金高温力学性能的影响。结果表明:当挤压压力从0 MPa增加到75 MPa时,合金的高温力学性能明显提高,但抗拉强度和屈服强度的增加值随温度升高而逐渐减小。挤压压力可以消除合金中的缩松,抑制合金中针状Al7Cu2Fe相的形成,使块状Al7Cu2Fe相及Al9FeNi相分布更为弥散,并形成联通的骨骼状结构。但是,挤压压力也使合金晶间热稳定性好的富铁相数量减少,同时,细化合金晶粒及二次枝晶,增加晶界数量。
[Abstract]:The microstructure and mechanical properties of squeeze casting Al-5.0Cu-0.6Mn-1.0Fe-1.0Ni alloy with T7 heat treatment state were studied by means of tensile test, optical microscope, scanning electron microscope, transmission electron microscope and electron probe X-ray diffraction. The effect of extrusion pressure on the high temperature mechanical properties of the alloy was studied. The results showed that when the extrusion pressure was increased from 0 MPa to 75 MPa, the high temperature mechanical properties of the alloy were obviously improved. However, the increase of tensile strength and yield strength gradually decreases with the increase of temperature. Extrusion pressure can eliminate the shrinkage and porosity in the alloy, inhibit the formation of needle-like Al7Cu2Fe phase in the alloy, and make the distribution of bulk Al7Cu2Fe phase and Al9FeNi phase more dispersed. However, extrusion pressure also reduced the number of rich iron phases with good intergranular thermal stability, at the same time, refined the alloy grain and secondary dendrite, and increased the number of grain boundaries.
【作者单位】：华南理工大学机械与汽车工程学院;
【基金】：GD-NSFC联合基金资助项目(U1034001) 国家自然科学基金资助项目(51374110) 教育部博士点基金资助项目(20120172110045)
【分类号】：TG146.21

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