Pd-Ni-P非晶合金多形性转变的成分依赖性  

Composition dependence of polyamorphic transition in Pd-Ni-P metallic glasses

作　　者：杜清 刘雄军 曹一欢 曾桥石 王辉 吴渊 蒋虽合 张晓宾 吕昭平 Qing Du;Xiong-Jun Liu;Yihuan Cao;Qiaoshi Zeng;Hui Wang;Yuan Wu;Suihe Jiang;Xiaobin Zhang;Zhao-Ping Lu(Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China;Center for High Pressure Science and Technology Advanced Research,Shanghai 201203,China;Jiangsu Key Laboratory of Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China [2]Center for High Pressure Science and Technology Advanced Research,Shanghai 201203,China [3]Jiangsu Key Laboratory of Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China

出　　处：《Science China Materials》2023年第11期4189-4196,共8页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(52071024,52271003,52101188);Guangdong Basic and Applied Basic Research Foundation(2020B1515120077);the Funds for Creative Research Groups of NSFC(51921001);the Projects of International Cooperation and Exchanges of NSFC(51961160729,52061135207);the 111 Project(BP0719004);the Program for Changjiang Scholars and Innovative Research Team in University of China(IRT_14R05);the Project funded by China Postdoctoral Science Foundation(2020M680009)。

摘　　要：非晶合金复杂的化学成分特征为理解多形性转变带来了巨大挑战.在本文中,我们系统研究了(PdNi)_(100−x)P_(x)(15 at%<x<21 at%)非晶合金中加热诱导多形性转变的化学成分依赖性.差热分析与结构因子的演化规律表明重入型玻璃转变会随着P含量的增加(不超过17 at%)而逐渐被抑制,扩展X射线吸收精细结构分析拟合后的结构参数与原位升温同步辐射结果显示重入型玻璃转变的成分依赖性来源于金属–类金属键对(即Pd/Ni–P对)的成键能力差异以及由此导致的短程至中程有序化转变.这种成分依赖性可以导致重入型液-液转变和玻璃转变在Pd_(41.5)Ni_(41.5)P_(17)非晶合金中均可发生.本研究有助于加深对重入型玻璃转变原子机制的认识,同时澄清了对于Pd–Ni–P非晶合金体系中多形性转变结构起源的困惑.The complexity of polyamorphic transitions(PTs)in metallic glasses(MGs),particularly their intricate chemical effect,makes it challenging to understand the nature of PTs and the glass state in MGs.In this work,we system-atically investigated the chemical dependence of thermally induced PTs in(PdNi)_(100−x)P_(x)MGs,where P content varies from 15 to 21 at%.Differential scanning calorimetry analyses coupled with structure factor evolution indicate that reentrant glass transition occurring in alloys with a P content of<17 at%is suppressed with an increase in P.The structural parameters fitted using extended X-ray absorption fine structure and in-situ synchrotron X-ray scattering measure-ments reveal that the composition dependence of reentrant glass transition originates from the metal-metalloid bond(i.e.,Pd/Ni-P bonds)rearrangement and the consequent short-range ordering to medium-range ordering.This results in the coexistence of reentrant liquid-liquid and glass transitions in Pd_(41.5)Ni_(41.5)P_(17)MGs.This finding enriches our understanding of the atomic mechanism of reentrant glass transition and clarifies the confusion on the structural origin of PTs in the Pd-Ni-P system.

关 键 词：metallic glass compositional dependence glass transition in-situ synchrotron X-ray scattering extended X-ray absorption fine structure 

分 类 号：TG139.8[一般工业技术—材料科学与工程]