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首页> 外文期刊>Materials Transactions, JIM >Preparation of Bulky Amorphous Zr-Al-Co-Ni-Cu Alloys by Copper Mold Casting and Their Thermal and Mechanical Properties
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Preparation of Bulky Amorphous Zr-Al-Co-Ni-Cu Alloys by Copper Mold Casting and Their Thermal and Mechanical Properties

机译：铜模铸造大块非晶Zr-Al-Co-Ni-Cu合金的制备及其热力学性能

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摘要

Bulky amorphous alloys were found to form in Zr-Al-M (M = Co, Ni, Cu) systems by arc melting on a copper hearth. The largest thickness for glass formation is 6.1 mm for Zr_(60)Al_(10)Co_3Ni_9Cu_(18), 6.8 mm for Zr_(60)Al_(15)CO_5Ni_(15)Cu_5 and 6.2 mm for Zr_(55)Al_(20)Co_(17.5)Ni_(2.5)Cu_5. The optimum composition for glass-forming ability shifts from the Cu-rich side to the Co-rich side through the Ni-rich side with increasing Al content from 10 to 20%. The use of a metallic mold casting process enabled the formation of amorphous cylinders with the largest diameter of 7 mm for the three alloys. The compositional effect for the large glass-forming ability has also been discussed by taking the present data into consideration. The cast amorphous Zr_(60)Al_(10)Co_3Ni_9Cu_(18) alloy subjected to tensile testing exhibits distinct serrated flow before final fracture. The generation of the serrated flow is noticed because the alloy has a ductile nature which enables the momentary stop of the shear sliding. The Young's modulus, tensile fracture strength and fracture elongation are 97 GPa, 1510 MPa and 2.0%, respectively. The fracture occurs along the maximum shear plane and the fracture surface consists of a well-developed vein pattern. The size of their veins is about 10 times as large as that for the melt-spun ribbon and hence the shear deformation region occurs in a much wider region for the cast alloy, indicating the necessity of a larger amount of energy up to final fracture. The finding of the amorphous alloys with the large glass-forming ability and the extremely ductile nature is important for the subsequent development of metallic glassy materials.
机译：发现大块非晶合金是通过在铜炉床上电弧熔化在Zr-Al-M（M = Co，Ni，Cu）系统中形成的。 Zr_（60）Al_（10）Co_3Ni_9Cu_（18）的最大玻璃形成厚度为6.1 mm，Zr_（60）Al_（15）CO_5Ni_（15）Cu_5的厚度为6.8 mm，Zr_（55）Al_（20）的厚度为6.2 mm Co_（17.5）Ni_（2.5）Cu_5。随着Al含量从10％增加到20％，用于玻璃形成能力的最佳组成从富Cu侧到富Co侧通过富Ni侧。使用金属模铸工艺可以形成三种合金的最大直径为7毫米的非晶圆柱体。通过考虑本数据也已经讨论了对于大的玻璃形成能力的组成作用。经过拉伸测试的铸造非晶Zr_（60）Al_（10）Co_3Ni_9Cu_（18）合金在最终断裂之前呈现出明显的锯齿状流动。锯齿状流的产生是值得注意的，因为该合金具有延展性，可以暂时停止剪切滑动。杨氏模量，拉伸断裂强度和断裂伸长率分别为97GPa，1510MPa和2.0％。断裂沿最大剪切平面发生，并且断裂表面由发育良好的静脉纹组成。它们的脉的尺寸大约是熔纺带的10倍，因此，剪切变形区域出现在铸造合金的更宽范围内，这表明需要大量的能量直至最终断裂。具有大的玻璃形成能力和极好的延展性的非晶态合金的发现对于随后的金属玻璃态材料的开发很重要。

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