大塊非晶合金形成能力及穩(wěn)定性研究.pdf

1、大連理工大學(xué)碩士學(xué)位論文大塊非晶合金形成能力及穩(wěn)定性研究姓名：王曉東申請學(xué)位級(jí)別：碩士專業(yè)：金屬材料及熱處理指導(dǎo)教師：齊民20000301鑾堡些三查蘭堡主笙苧一—————————塑——』曼————一AbstractThebulkamorphousalloyshavestrongglassformingability，butthemicro—mechanismofthischaracteristiccannotbeunderstoodat

2、presenttime，Inthisdissertation，wehaveinvestigatedtherelationshipbetweenglassfonningabilityandnegativemixingheatelasticswainenergybasedonMiedemasemiempiricalmodelTheresultSshowthatthemorenegativethemixingheatisandthehighe

3、relasticstrainenergyis，thestrongertheglassformingabilitybecomeinacertainrangeofcompositionFromthesewecandrawaconclusionthatthekeytocontrolamorphousformationliesinthenatureofbondingAtthesametime，wealsohopedtostudythisinte

4、rac扛onbetweendifferentatoms，whichcarlinfluenceamorphousformationinmulticomponentsystemsbymeansofDiscreteVariationalMethodandputforwardanideatothedesignofamorphousalloysbyusingthismethodWepreparedtheZr—basedamorphousalloy

5、softhebinary一ternaryandquaternarybymeansofvacnllrl2缸cmelfmgplussimplespinningmeRingoranvilhammerme血odItiSshoxvnfiomthecurvesofDTAandDSCthatthedisvitrificationofamorphousofZr6i刖，sCu!一5andzr65A175NiloCuⅢtakeplacebeyond400。

6、CAfterthedisxJtfificationofternaryZr65A175Cu275alloy，bothdispersedprecipitationandsmallcr)’stalCanbeseenontheBFphotographofTEMBythefurtheranalysisofEDEthemainprecipitationistI—Zr2(AI，Cu)SowesupposedthatA1atomsdissolx’ing

7、inZr2CucouldraisethestrainenergyofthesystemOntheotherhand，theincreasingofbondingbetweenA1electronandZrelectronwilldecreasetheinteractionbetweenCuelectsonandZrelectron，whichrestrainedtheprecipitationofZr2Cuandimprovedthef