Tb添加对Cu-Zr-Al合金玻璃形成能力和力学性能的影响

Effect of Tb Addition on Glass-Forming Ability and Mechanical Properties of Cu-Zr-Al Alloy

【目的】非晶态合金通常具有较高的强度和弹性,但在室温下却表现出明显的宏观脆性。考虑向非晶态合金中引入稀土元素,研究它的性能变化进而希望达到有效调控非晶态合金性能的目的。【方法】通过向Cu_(50)Zr_(46)Al_(4)非晶态合金中添加微量的Tb元素,利用铜模吸铸法制备了一系列的Cu_(50-x)Zr_(46)Al_(4)Tb_(x)(x=0,1,2,3,4)非晶态合金。【结果】实验结果表明,Tb组元的引入可以提高Cu_(50)Zr_(46)Al_(4)合金的玻璃形成能力。其中:原子数百分比(at.%)为1at.%的Tb添加使合金获得了最大的γ参数值,合金体系的热稳定性明显提高。力学性能测试结果显示,3at.%的Tb添加可以明显提高合金的强度和塑性应变能力。同时,Tb组元的引入使Cu_(50)Zr_(46)Al_(4)非晶态合金的硬度降低,并可以改变合金结构和硬度分部规律,有利于合金塑性变形能力的提高。【结论】为探究微量稀土元素的添加对非晶态合金物性的影响提供了实验依据。

[Purposes]Amorphous alloys usually have high strength and elasticity,while their macroscopic brittleness at room temperature cannot be ignored.Rare earth elements are beneficial to improve properties of amorphous alloys.[Methods]A series of amorphous alloys Cu_(50)-xZr_(46)Al_(4)Tbx(x=0,1,2,3,4)were prepared by copper mold suction casting method based on the fabrication of Cu_(50)-xZr_(46)Al_(4) amorphous alloy by Tb addition.[Findings]The experimental results show that the glass forming ability of Cu_(50)-xZr_(46)Al_(4) alloy can be improved significantly due to the addition of Tb element.The maximum value ofγparameter was obtained by adding 1 at.% Tb,indicating appropriate addition of Tb can improve the thermal stability of Cu-Zr-Al alloy.Moreover,the strength and plastic deformation ability of Cu-Zr-Al alloy could be significantly improved by adding 3 at.%.Additionally,hardness of this Cu-Zr-Al alloy is decreased by adding Tb element,while their structure and division of hardness can be adjust,which is conducive to the improvement of their plastic deformation ability.[Conclusions]Experimental basis for exploring the influence of rare earth elements on the physical properties of amorphous alloys were provided by this work.