Cu含量对钛镍基非晶复合材料的组织和力学性能的影响（英文）

Effects of Cu Content on Microstructures and Mechanical Properties of Ti-Ni-Based Amorphous Composites

采用铜模吸铸法成功制备Cu含量不同但直径相同的TiN i基非晶复合材料试样 (Ti_(0.5)Ni_(0.5))_(100-x)Cu_x,研究Cu含量(x=0,10,15,20,25,30,35,40)对TiN i基非晶复合材料组织和力学性能的影响。试验结果表明,在铜的含量x=20时,合金断裂强度和塑性应变都很高,此时合金具有最优良的综合性能。随着x值的增大, (Ti_(0.5)Ni_(0.5))_(100-x)Cu_x合金的非晶形成能力呈现一个从上升、降低再到上升的波形变化,但总体呈现降低趋势。Cu元素在TiN i基复合材料中的适量添加(x≈25)可以提高TiN i基非晶材料的塑性,但添加量较多(x>30)时,既不能提高合金的非晶形成能力又不能提高合金的强度。在x=15时,合金有最高的断裂强度2440 MPa,达到了较高的屈服强度1471MPa,且其产生了17.15%的塑性应变,在x=25时,合金塑性应变有所提高,塑性变形达到了21.35%。

Ti-Ni-based amorphous composite samples （Ti（0.5）Ni（0.5））（100-x）Cux with different Cu contents but the same diameter which has been prepared by the copper mold suction casting. The effect of the Cu contents（x=0, 10, 15, 20, 25, 30, 35, 40, at%） on the microstructures and mechanical properties of the amorphous composites was studied. Results show that both fracture strength and plastic strain of the alloy are very high when the copper content is x=20. Meanwhile the alloy exhibits the best comprehensive properties. As the x value increases, the glass forming ability of （Ti（0.5）Ni（0.5））（100-x）Cux alloy shows a waveform change from increasing to decreasing and then to increasing, but following an overall trend towards decreasing. The plasticity of Ti-Ni-based amorphous materials can be improved by adding Cu element in modest quantities（x≈25） to the Ti-Ni-based composites; however, adding more Cu（i.e., x30） neither can improve the amorphous forming ability nor can enhance its strength. When x=15, the alloy has the highest breaking strength of 2440 MPa while gets the higher yield strength of 1471 MPa causing 17.15% plastic strain. The data are pretty high with respect to other amorphous systems or other alloy systems with memory of their shapes. When x=25, there is a certain increase in the alloy plastic strain with 21.35% plastic deformation.