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首页> 外文期刊>Journal of Materials Engineering and Performance >Mechanical Performance of Zr-Containing 354-Type Al-Si-Cu-Mg Cast Alloy: Role of Geometrical Discontinuities
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Mechanical Performance of Zr-Containing 354-Type Al-Si-Cu-Mg Cast Alloy: Role of Geometrical Discontinuities

机译：含ZR 354型Al-Si-Cu-Mg铸造合金的机械性能：几何不连续性的作用

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The main objective of this study was to evaluate the performance of 354-type Al-Si-Cu-Mg cast alloys at both ambient (25 degrees C) and elevated temperatures (250 degrees C) through the addition of zirconium (Zr), nickel (Ni) and manganese (Mn). The motive behind these additions was to develop thermally stable alloys capable of resisting softening instigated by prolonged exposure at elevated temperatures and hence preserve acceptable mechanical properties. Another parameter affecting performance is geometry. Four different notch geometries were employed: two hole-type geometries and two types of V-notches (symmetric and asymmetric for each). The results reveal that the presence of asymmetric notches in the tensile test bars proved to be more deleterious than symmetric notches to the notch tensile strength and percentage elongation to fracture at both 25 degrees C and at 250 degrees C. The softening that took place during tensile testing at 250 degrees C rendered the alloys some ductility (in particular, the M1S (354 + 0.3 wt.% Zr), M2S (354 + 0.3 wt.% Zr + 2 wt.% Ni) and M3S alloys (354 + 0.3 wt.% Zr +0.75 wt.% Mn)), as a result, the notched tensile bars with asymmetric holes exhibited high strength values for these alloys compared to the tensile strength of unnotched bars subjected to similar heat treatment conditions owing to the presence of notches. The notch sensitivity ratios vary between 0.78 and 0.95 for asymmetric holes versus 0.7 and 0.85 for asymmetric V-notches at room temperature and 0.9 and 1.07 for asymmetric holes versus 0.7 and 0.92 for asymmetric V-notches at 250 degrees C.
机译：本研究的主要目的是通过添加锆（Zr）、镍（Ni）和锰（Mn），评估354型Al-Si-Cu-Mg铸造合金在室温（25℃）和高温（250℃）下的性能。这些添加物背后的动机是开发热稳定的合金，能够抵抗高温下长时间暴露引起的软化，从而保持可接受的机械性能。影响性能的另一个参数是几何图形。采用了四种不同的切口几何形状：两种孔型几何形状和两种V型切口（对称和不对称）。结果表明，与对称缺口相比，在25℃和250℃下，拉伸试验棒中不对称缺口的存在对缺口拉伸强度和断裂伸长率的危害更大。在250℃下拉伸试验期间发生的软化使合金具有一定的延展性（尤其是M1S（354+0.3 wt.%Zr），M2S（354+0.3 wt.%Zr+2 wt.%Ni）和M3S合金（354+0.3 wt.%Zr+0.75 wt.%Mn）），因此，由于存在缺口，具有非对称孔的缺口拉伸杆与经受类似热处理条件的无缺口拉伸杆相比，这些合金的强度值较高。室温下，非对称孔的缺口灵敏度比在0.78和0.95之间变化，非对称V型缺口的缺口灵敏度比在0.7和0.85之间变化；250℃下，非对称孔的缺口灵敏度比在0.9和1.07之间变化，非对称V型缺口的缺口灵敏度比在0.7和0.92之间变化。

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