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The Effect of Ni and Zr Additions on the Tensile Properties of Isothermally Aged Ai–Si–Cu–Mg Cast Alloys
International Journal of Metalcasting ( IF 2.6 ) Pub Date : 2021-05-22 , DOI: 10.1007/s40962-021-00615-6
J. Hernandez-Sandoval , G. H. Garza-Elizondo , M. H. Abdelaziz , A. M. Samuel , H. W. Doty , F. H. Samuel

The present study was carried out to investigate the effects of Ni and Zr additions, individually or in combination, on the room-temperature tensile properties of 354 casting alloy (Al–9wt%Si–1.8wt%Cu–0.5wt%Mg) which was isothermally treated at temperatures in the range of 155–350 °C and aging times up to 1000 h. Tensile tests were carried out in the as-cast, solution heat-treated, and aged conditions using different aging times up to 1000 h. Quality charts were used as an evaluation tool for selecting the optimum conditions to achieve superior tensile properties and optimum quality in 354-type alloys. Zirconium reacts only with Ti, Si, and Al to form (Al,Si)2(Zr,Ti), (Al,Si)3(Zr,Ti), and Al3Zr phases. The beneficial effects of Zr and Ti additions appear in the refining of the α-Al grain size which reduces the size of the Al2Cu and α-Fe particles. Tensile test results at ambient temperature show a slight increase in alloys with Zr and Zr/Ni additions, particularly at aging temperatures above 240 ºC. It is suggested that the maximum obtainable quality index values by means of heat treatment are the difference between the quality index values for the as-cast and solution heat treatment conditions.



中文翻译:

Ni和Zr添加量对等温时效Al-Si-Cu-Mg铸造合金拉伸性能的影响

本研究旨在研究单独或组合添加Ni和Zr对354铸造合金(Al–9wt%Si–1.8wt%Cu–0.5wt%Mg)的室温拉伸性能的影响。在155-350°C的温度下进行了等温处理,老化时间长达1000 h。拉伸试验在铸态,固溶热处理和时效条件下进行,使用长达1000小时的不同时效时间。质量图表用作评估工具,用于选择最佳条件,以在354型合金中获得优异的拉伸性能和最佳质量。锆仅与Ti,Si和Al反应形成(Al,Si)2(Zr,Ti),(Al,Si)3(Zr,Ti)和Al 3Zr相。Zr和Ti的添加的有益效果出现在α-Al晶粒尺寸的细化中,这减小了Al 2 Cu和α-Fe颗粒的尺寸。在室温下的拉伸试验结果表明,添加Zr和Zr / Ni的合金略有增加,特别是在时效温度超过240ºC的情况下。建议通过热处理获得的最大质量指标值是铸态和固溶热处理条件下的质量指标值之差。

更新日期:2021-05-22
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