氧化锆陶瓷超塑性变形行为及机理  

Superplastic Behavior and Deformation Mechanism of Zirconia Ceramics

作　　者：陈国清[1,2] 朱晓丽 王康 付雪松 周文龙[1,2] CHEN Guo-Qing;ZHU Xiao-Li;WANG Kang;FU Xue-Song;ZHOU Wen-Long(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,China;Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province),Dalian 116085,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116085 [2]辽宁省凝固控制与数字化制备技术重点实验室,辽宁大连116085

出　　处：《现代技术陶瓷》2017年第6期433-439,共7页Advanced Ceramics

基　　金：国家自然科学基金(51675078;50875032;50505005)

摘　　要：研究了不同晶粒尺寸的3Y-TZP在高温下的变形行为,探究了压头速度和变形温度对材料超塑性变形的影响。结果表明,3Y-TZP陶瓷的超塑性变形抗力随变形温度的提高和压头速度的降低而降低。变形后晶粒尺寸增大,但仍保持等轴晶。在1250℃采用应力突变法对不同晶粒尺寸的材料进行压缩试验,实验结果与经典的蠕变方程相吻合。在一定的晶粒尺寸范围内,3Y-TZP陶瓷的应力指数随着晶粒尺寸的增大而减小。在温度1250℃时,3Y-TZP的主要变形机制为伴随扩散的晶界滑动。The high temperature deformation behavior of3mol%yttria stabilized tetragonal zirconia polycrystals(3Y-TZP)with different grain sizes has been researched by means of the compression tests.The influence of the punch velocity and the temperature on the deformation behavior was analyzed.The results demonstrated the deformation resistance of3Y-TZP decreased with the increase of the punch velocity,as well as the deforming temperature.The grain size increased after deformation,while the grains remained equiaxed.The stress-jump deformation was conducted at1250℃.The experimental results were consistent with the classical flowing law for superplastic ceramics.The stress exponents were measured as a function of the grain size.It was found that the stress exponent increased with the decrease of grain size in a certain range.The deformation mechanism of the3Y-TZP at1250℃was grain boundary sliding accompanied by the diffusion.

关 键 词：3Y-TZP 超塑性 晶粒尺寸 晶界滑动 

分 类 号：TB301[一般工业技术—材料科学与工程]