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Effect of solidification parameters on mechanical properties of directionally solidified Al-Rich Al-Cu alloys

机译：凝固参数对定向凝固富铝Al-Cu合金力学性能的影响

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摘要

Al(100−x)-Cux alloys (x=3 wt%, 6 wt%, 15 wt%, 24 wt% and 33 wt%) were prepared using metals of 99.99% high purity in vacuum atmosphere. These alloys were directionally solidified under steady-state conditions by using a Bridgman-type directional solidification furnace. Solidification parameters (G, V and ), microstructure parameters (λ1, λ2 and λE) and mechanical properties (HV, σ) of the Al-Cu alloys were measured. Microstructure parameters were expressed as functions of solidification parameters by using a linear regression analysis. The dependency of HV, σ on the cooling rate, microstructure parameters and composition were determined. According to experimental results, the microhardness and ultimate tensile strength of the solidified samples was increased by increasing the cooling rate and Cu content, but decreased with increasing microstructure parameters. The microscopic fracture surfaces of the different samples were observed using scanning electron microscopy. Fractographic analysis of the tensile fracture surfaces showed that the type of fracture significantly changed from ductile to brittle depending on the composition.
机译：在真空气氛中使用99.99％高纯度的金属制备Al（100-x）-Cux合金（x = 3 wt％，6 wt％，15 wt％，24 wt％和33 wt％）。通过使用Bridgman型定向凝固炉在稳态条件下定向凝固这些合金。测量了Al-Cu合金的凝固参数（G，V和），微观结构参数（λ1，λ2和λE）和力学性能（HV，σ）。通过使用线性回归分析，将微结构参数表示为凝固参数的函数。确定了HV，σ对冷却速率，组织参数和成分的依赖性。根据实验结果，通过增加冷却速率和Cu含量可以提高凝固样品的显微硬度和极限抗拉强度，但是随着显微结构参数的增加，显微硬度和极限抗拉强度会降低。使用扫描电子显微镜观察不同样品的微观断裂表面。对拉伸断裂表面的分形分析表明，断裂的类型根据组成的不同，从延性转变为脆性。

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  • 来源
    《Metals and Materials International》 |2013年第3期|411-422|共12页
  • 作者

    Emin Çadırlı;

  • 作者单位

    Faculty of Arts and Sciences Department of Physics Niǧde University">(13006);

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