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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of delta-Al3CuNi phase and thermal exposure on microstructure and mechanical properties of Al-Si-Cu-Ni alloys
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Effect of delta-Al3CuNi phase and thermal exposure on microstructure and mechanical properties of Al-Si-Cu-Ni alloys

机译：Delta-Al3cuni相和热暴露对Al-Si-Cu-Ni合金微观结构和力学性能的影响

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摘要

The effect of delta-Al3CuNi phase and thermal exposure on microstructure and mechanical properties of Al-Si-Cu-Ni alloy is investigated by optical microscopy, scanning electron microscope, and tensile test. The alloys with different volume fractions of delta-Al3CuNi phase are designed according to the thermodynamic calculation, which is confirmed by the microstructure characterization. The mean diameter of primary Si increases while the eutectic Si decreases with increasing the volume fraction of delta-Al3CuNi phase. The eutectic Si is coarsening during thermal exposure at 350 degrees C. Both strip-shape and flshbone-shape delta-Al3CuNi phase are observed in the as-cast alloys. In addition, the flshbone-shape delta-Al3CuNi phase is composed of many independent short rods. Parts of the thin short rods of delta-Al3CuNi phase change into gamma-Al7Cu4Ni phase after thermal exposure at 350 degrees C for 200 h. The ultimate tensile strength and yield strength increase while the elongation decreases with increasing the volume fraction of delta-Al3CuNi phase. Comparing with the as-cast alloys, the ultimate tensile strength and yield strength are reduced after thermal exposure at 350 degrees C for 200 h, but the elongation of the alloys is increased. The failure mechanism of the alloys tested at 25 degrees C is quasi-cleavage fracture and ductile fracture is the dominant fracture mechanism tested at 350 degrees C. (C) 2019 Elsevier B.V. All rights reserved.
机译：通过光学显微镜，扫描电子显微镜和拉伸试验研究了Delta-Al3cuni相和热暴露对Al-Si-Cu-Ni合金微观结构和力学性能的影响。根据热力学计算设计了具有不同体积分数的合金，其通过微观结构表征确认。主要Si的平均直径增加，而共晶Si随着增量δ-Al3Cuni相的体积分数而降低。在350℃的热暴露期间，共晶Si在350℃下粗化。在铸造合金中观察到条带形和扁平骨形δ-Al3cuni相。此外，Flshbone形δ-Al3cuni相由许多独立的短杆组成。 δ-Al3cuni薄杆的薄杆的薄杆，在热暴露于350℃的热暴露后变成γ-Al7cu4Ni相200小时。伸长率随着δ-Al3CunI相的体积分数而降低而伸长率降低的极限拉伸强度和屈服强度增加。与铸造合金相比，在350℃的热暴露于200小时后，最终拉伸强度和屈服强度降低，但是合金的伸长率增加。在25℃下测试的合金的失效机制是准切割骨折和延展性裂缝是在350℃的主要骨折机制，2019年ELSEVIER B.V.保留所有权利。

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