机械合金化对fecual热压烧结的影响

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1、万方数据2008年4月金刚石与磨料磨具T程Apr．2008总第164期第2期Diamond＆AbrasivesEngineeringSerial．164No．2文章编号：1006—852X(2008)02—0025—04机械合金化对Fe—Cu—Al热压烧结的影响+孙金峰李晓普王明智(燕山大学材料学院亚稳材料制备技术与科学国家重点实验室，河北秦皇岛066004)摘要本文利用XRD、SEM、DSC等手段研究了Fe—Cu—A1粉末体系机械合金化(MA)过程金属粉体的结构变化及储能情况。将机械合金化处理后的粉末进行热压烧结，并对

2、烧结体进行了金相组织、硬度和抗折强度分析。结果表明，Fe—Cu—Al经MA处理能够形成二元及三元固溶体，粉体粒度和晶粒度明显细化，粉体内储存了大量的表面能和界面能。球磨20h晶粒度达到稳定值20tim，粉体储能达到最大值385．1J／g，球磨30h粉体粒度达到稳定状态。随着球磨时间的延长，粉末烧结体的成分趋于均匀，组织不断细化。粉末烧结体的硬度在球磨初期显著提高，超过10h后硬度提高缓慢，而烧结体的抗折强度随着球磨时间的延长几乎成线性增长。球磨50h粉末烧结体的洛氏硬度和抗折强度分剐达到108HRB和351MPa。关键词

3、机械合金化；热压烧结；储能；洛氏硬度；抗折强度中图分类号TG74文献标识码AEffectofmechanicalalloyingOilhot-pressingsinteringFe—Cu—AISunJinfengLiXiaopuWangMingzhi．，(StateKeyLaboratoryofMetastableMaterialsScience&TechnoLogy，YanshanUniversity，Qinhuangdao066004，China)、AbstractThestructurechangeandthest

4、oredenergyintheFe—Cu—A1powderstreatedbyMechanicalAlloying(MA)wereanalyzedbyX—raydiffraction(XRD)，scanningelectronmicroscope(SEM)anddifferentialscanningcalorimetry(DSC)．Themilledpowdersweresinteredbyhot—presssinteringandthemicrostructure，hardnessandbendingstrength

5、ofthesinteredsampleswereanalyzed．，TheresultsshowedthatFe—Cu—A1canbeformedintobinaryandternarysolidsolutionbyMA．thepartic]esizeandthegrainsizewererefinedobviouslybyMAandagreatmanysurfaceenergyandinterfaceenergywasstoredinthepowders．Bymilling20hoursthegrainsizeofth

6、emilledpowdersreachedthemaximumof20nmandthestoredenergyinthepowdersreachedthemaximumof98J／g．Theparticlesizereachedthesaturatedstateaftermilling30hours．Asthemillingtimeincreased，thecompositionofthepowdersbecameuniformandthemicrostructurewasrefined．Thehardnessofthe

7、sinteredsamplesincreasedobviouslyintheinitialstageofthemillingprocess，after10hoursthehardnessincreasedslowly．However，thebendingstrengthofthesinteredsamplesalmostincreasedlinearlywiththemillingtime．Bymilling50hourstheRockwellhardnessandthebendingstrengthofthesinte

8、redsamplesreached108HRBand351MPa，respectively．·河北省自然科学基金资助项目(E2004000218)万方数据金刚石与磨料磨具工程总第164期Keywordsmechanicalalloying；hot—presssintering；storedenergy；Rockwel