Cu含量对钛镍基非晶复合材料的组织和力学性能的影响

采用铜模吸铸法成功制备Cu含量不同但直径相同的TiNi基非晶复合材料试样(Ti0.5Ni0.5)100-XCuX,研究Cu含量在(X=0,10,15,20,25,30,35,40)情况下对TiNi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,(Ti0.5Ni0.5)100-XCuX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TiNi基复合材料中的适量添加(x=25左右时)可以提高Ti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2440MPa,达到了1471MPa的较高的屈服强度值,且其产生了17.15%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%。

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

Ti-Ni-based amorphous composite samples (Ti0.5Ni0.5)100-XCuX with the same CuX but the different diameters which had been prepared successfully by the copper mold suction casting were used to study the effect of their Cu contents (X=0, 10, 15, 20, 25, 30, 35 and 40) on the microstructures and mechanical properties of such amorphous composites. The results show that both fracture strength and plastic strain of the alloy are very high while the copper content is x=20. And the alloy exhibits the best comprehensive properties. As the x values increase, the glass forming ability of (Ti0.5Ni0.5)100-XCuX alloy shows a waveform change from increasing to decreasing and then to increasing, but following an overall trend towards decreasing. The plasticity of Ti-based amorphous materials can be improved by adding Cu element in modest quantities (x = approx. 25) to the Ti-Ni-based composites; however adding more numbers (i.e., x > 30), neither can improve the amorphous forming ability nor can enhance its strength. When x = 15, the alloy has the highest breaking strength of 2,440 MPa while reach the higher yield strength of 1471 MPa and cause a 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, whereas underwent a 21.35% plastic deformation.