smco非晶合金的制备、表征及晶化研究

《smco非晶合金的制备、表征及晶化研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、捅费摘要非晶合金由于具有许多独特的物理与力学性能，其研究是目前新材料和凝聚态物理领域的前沿课题。稀土一过渡金属二元系合金稳定的非晶块体材料的制备一直是非晶材料研究领域的挑战性难题。本研究组以Sm．Co二元合金体系为例，探索出了一条制备稀土一过渡金属二元合金非晶块体材料的创新途径。本文采用真空感应熔炼制备Sm．Co合金铸锭、高能球磨制取合金非晶念粉末、高压放电等离子烧结(SPS)致密化的工艺路线，制备获得了稳定的Sm．Co二元合金非晶块体材料；对块体材料进行XRD、DSC、SEM、TEM等表征和分析，研究了二元非晶合金的结构和制备工艺的关系。首先利用高能球磨的方法制备出了SmC02非晶合金粉术

2、，利用高压SPS技术制备出了SmC02非晶合金块体材料。XRD、DSC、SEM和TEM等测试分析表明，SmC02合金具有比较强的非晶形成能力。利用非晶样品在不同条件下的退火实验研究了非晶样品的晶化机制，获得了晶化分数与退火温度之间的定量关系。对具有非晶和纳米晶不同结构状态的样品进行了热膨胀、力学性能和磁性能的测试分析。利用高能球磨工艺还制备了SmC05非晶合金粉末，并利用高压SPS技术制备出了SmC05非晶合金块体材料。利用XRD、DSC、SEM和TEM等手段系统研究了制备样品的非晶态结构。通过对非晶样品在不同条件下的退火实验研究了非晶晶化机制，并对具有非晶和纳米晶不同结构状态的样品进行了热

3、膨胀和磁性能的测试分析。关键词块体非晶；Sm．Co合金；高能球磨；放电等离子烧结ABSTRA(可ABSTRACTBecauseamorphousalloyshavemanyuniquephysicalandmechanicalproperties，theinvestigationsonsuchmaterialshavebecomethefocusinthefieldsofthecondensedphysicsandnewmaterials．Preparationofthestablebinaryrareearth-transitionmetalbulkamorphousalloysissti

4、llachallengeintherelatedfieldsintheworld．UsingthebinarySm-Coalloyssystemasanexample，ourgroupproposedanovelapproachforpreparationofbinaryrareearth-transitionmetalbulkamorphousalloys．Inthispaper,firstly,Sm—Coalloysingotswerepreparedbyinductionmeltinginthevacuum．Thentheamorphousalloyspowderwasprepared

5、byhi曲-energyballmilling．Subsequently,thestablebinarySm—CobulkamorphousalloysWasobtainedbysparkplasmasintering(SPS)fromtheamorphouspowder．ThebulkamorphousalloyswasexaminedbyX-raydiffraction(XRD)，differentialscanningcalorimeter(DSC)andtransmissionelectronmicroscopy(TEM)．Therelationshipbetweenthestruc

6、tureandthepreparationparametersofthesampleswasstudied．Atfirst，SmC02amorphousalloyspowderWaspreparedbyhighenergyballmilling．BySPSthestableSmC02bulkamorphousalloyswasobtainedfromtheamorphouspowder．ThesamplewasmeasuredbyXRD，DSC，SEMandTEM，showingastrongerglassformingability(GFA)．Theamorphoussampleswere

7、annealedatdifferentconditionstostudythecrystallizationmechanismoftheamorphoussample，andthequantitativerelationshipwasobtainedbetweenthecrystallizationfractionandtheannealingtemperature．Thephysicalandmechani