简介:TheslidingfrictionandwearbehaviorsofMg–11Y–5Gd–2Zn–0.5Zr(wt%)alloywereinvestigatedunderoillubricantconditionbypin-on-diskconfigurationwithaconstantslidingdistanceof1,000minthetemperaturerangeof25–200°C.Resultsindicatethatthevolumetricwearratesandaveragefrictioncoefficientsdecreasewiththeincreaseofslidingspeeds,andincreasewiththeincreaseoftesttemperaturebelow150°C.ThehardandthermallystableMg12(Y,Gd)Znphasewithlong-periodstackingorderstructureinthealloypresentssignificantwearresistance.Thewearmechanismbelow100°Cisabrasivewearasaresultofplasticextrusiondeformation.Thecorporateeffectsofsevereabrasive,oxidative,anddelaminatingwearresultinthetribologicalmechanismabove100°C.
简介:激光冲击强化是一种新型表面处理技术,利用高功率激光束冲击金属零件表面,在零件表面形成较大的残余压应力,可有效改善零件的疲劳性能。以发动机1Cr11Ni2W2MoV叶片为研究对象,对其进行了激光冲击强化处理,研究强化处理对材料的微观组织和疲劳性能的影响。研究结果表明:相比未处理试样,激光冲击强化在1Cr11Ni2W2MoV叶片材料表层形成较大的残余压应力,表层晶粒更为细化,叶片的疲劳寿命提高1.7倍。