CAJ | 학술논문

对分别在1600℃、1650℃、1700℃条件下热压烧结制备的Si2 N2 O-Si3 N4超细晶陶瓷进行纳米压痕试验测试，获得了材料的硬度值、弹性模量值和载荷-深度曲线。考虑试验中波士压针的磨损缺陷，通过理论和数值模拟相结合的方法，确定压针的尖端球面半径 RBerk ＝500 nm。以纳米压痕试验数据为依据，利用 M SC. M arc有限元仿真软件模拟纳米压痕试验压针压入材料表面的过程，反推出所测试材料的应力应变关系曲线，其屈服应力随弹性模量的减小而降低，分别为47 GPa、43 GPa、35 GPa。通过比较分析压痕区域的应变场和应力场，分析纳米压痕试验中材料的变形特征。
대분별재1600℃、1650℃、1700℃조건하열압소결제비적Si2 N2 O-Si3 N4초세정도자진행납미압흔시험측시，획득료재료적경도치、탄성모량치화재하-심도곡선。고필시험중파사압침적마손결함，통과이론화수치모의상결합적방법，학정압침적첨단구면반경 RBerk ＝500 nm。이납미압흔시험수거위의거，이용 M SC. M arc유한원방진연건모의납미압흔시험압침압입재료표면적과정，반추출소측시재료적응력응변관계곡선，기굴복응력수탄성모량적감소이강저，분별위47 GPa、43 GPa、35 GPa。통과비교분석압흔구역적응변장화응력장，분석납미압흔시험중재료적변형특정。
The hardness ,the elastic modulus and the load-depth curves of the ultrafine-grained Si2 N2 O-Si3 N4 composites ,which are fabricated by hot-press sintering at 1600℃ ,1650℃ ,and 1700℃ ,are tested by nanoindentation .The imperfection of Berkov-ich indenter used in the nanoindentation test is considered ,and its tip radius ,RBerk =500 nm ,is determined by theoretical calcula-tion and numerical simulation .The processes of nanoindentation are simulated by finite element software MSC.MARC based on the nanoindentation experimental date .The stress-strain curves are derived through comparative analysis between simulation re-sults and experiment results .The yield stress of the materials tested by the nanoindentation increases with the increasing of the e-lastic modulus ,with corresponding values of 47 GPa ,43 GPa and 35 GPa .The deformation behaviour of the nanoindentation is further studied through comparative analysis of strain and stress distributions .