四元Gd_(55-x)Zr_(x)Al_(23)Ni_(22)非晶合金的凝固形成机理和微观力学性能研究  

Solidification mechanism and micromechanical properties of quaternary Gd_(55-x)Zr_(x)Al_(23)Ni_(22) amorphous alloy

作　　者：武博文 胡亮[1] 糜晓磊 魏炳波[1] WU BoWen;HU Liang;MI XiaoLei;WEI BingBo(School of Physical Science and Technology,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西北工业大学物理科学与技术学院,西安710072

出　　处：《中国科学：技术科学》2024年第7期1357-1367,共11页Scientia Sinica(Technologica)

基　　金：国家重点研发计划(编号:2021YFA0716301);国家自然科学基金(批准号:52088101,52171047)资助项目。

摘　　要：本文研究了不同成分Gd_(55-x)Zr_(x)Al_(23)Ni_(22)(x=0,15,25,35,45,55)非晶合金的凝固形成机理和微观力学性能变化规律.实验发现,由于Zr-Gd体系中存在不互溶间隙,液态四元Gd-Zr-Al-Ni合金在深过冷条件下发生亚稳相分离.只有当Zr与Gd不共存时,液态三元Gd_(55)Al_(23)Ni_(22)和Zr_(55)Al_(23)Ni_(22)合金可以快速凝固形成单相非晶.在530 K的过冷度下,液态Zr_(45)Gd_(10)Al_(23)Ni_(22)合金发生形核长大型亚稳相分离,并凝固为球状结构双相非晶.液态Gd_(55-x)Zr_(x)Al_(23)Ni_(22)(x=15,25,35)合金分别在189,336和438 K过冷度时发生调幅分解型亚稳相分离,均形成网状结构双相非晶.随着非晶AM-Zr相体积分数增加,非晶合金的平均硬度从3.95 GPa提高到7.95 GPa,弹性模量由58.27 GPa增大到101.37 GPa.Zr元素含量的升高使非晶合金的抗磨系数由5.2×10^(10)Pa增加到3.81×10^(11)Pa,表观摩擦系数从0.11减小到0.05.Here,we study the solidification mechanism and micromechanical properties of Gd_(55-x)Zr_(x)Al_(23)Ni_(22)(x=0,15,25,35,45,55)amorphous alloys in this work.As a result of the immiscibility gap in Zr-Gd,the liquid quaternary Gd-Zr-Al-Ni alloy occurs the metastable phase separation at a high undercooling.Only when Zr and Gd do not coexist,the liquid ternary Gd_(55)Al_(23)Ni_(22) and Gd_(55)Al_(23)Ni_(22) alloys can quickly solidify to a single amorphous phase.At an undercooling of 530 K,the liquid Zr_(45)Gd_(10)Al_(23)Ni_(22) alloy undergoes metastable phase separation in the manner of nucleation and growth.Therefore,it results in the formation of a spherical morphology with dual amorphous phases.The liquid Gd_(55-x)Zr_(x)Al_(23)Ni_(22)(x=15,25,35)alloys are separated at 189,336,and 438 K,respectively,and form the reticular structure dual amorphous phases.With the increase of the volume fraction of the amorphous AMZr phase,the average hardness of the amorphous alloy increases from 3.95 to 7.95 GPa,and the elastic modulus increases from 58.27 to 101.37 GPa.The wear resistance coefficient of the amorphous alloy increases from 5.2×10^(10) to 3.81×10^(11) Pa,and the apparent friction coefficient decreases from 0.11 to 0.05 with the increase of Zr content.

关 键 词：快速凝固 亚稳相分离 双相非晶 微观力学性能 

分 类 号：TG139.8[一般工业技术—材料科学与工程]