第41卷第2期2024年4月J.At.Mol.Phys.,2024,41:026002(6pp)V-5Cr-5Ti合金弹性和力学性质的第一性原理研究原子与分子物理学报JOURNALOFATOMICANDMOLECULARPHYSICSVol.41No.2Apr.2024杨彪,易易勇²,王丽阁²,王恩泽?(1.西南科技大学工程技术中心,绵阳621010;2.西南科技大学材料与化学学院,绵阳621010)摘要:V-5Cr-5Ti合金作为核聚变堆第一包层的主要候选结构材料之一,但对其力学性质的理论研究相对较少:采用随机固溶体模型,利用第一性原理方法计算出V-5Cr-5Ti合金的弹性常数、体模量、剪切模量、杨氏模量、泊松比和柯西压力等,并与计算出的纯钒的相关数值进行对比,结果表明V-5Cr-5Ti合金具有良好的塑性和强度,但其塑性要略低于纯钒的:并对加入氧原子后的V-5Cr-5Ti合金进行了相关计算,通过对比计算结果发现,由于氧原子的加入,使V-5Cr-5Ti合金的塑性和强度都出现了不同程度的降低:最后对V-5Cr-5Ti合金和纯钒的理论强度进行了计算,并绘制出两者的应力-应变关系图,通过对比再次验证了上面的结论,关键词:V-5Cr-5Ti合金;第一性原理;弹性性质;力学性质中图分类号:TB301First-principlesstudyonelasticandmechanicalpropertiesofV-5Cr-5TiAlloy文献标识码:AD0I:10.19855/j.1000-0364.2024.026002YANGBiao',YIYong",WANGLi-Ge’,WANGEn-Ze?(1.EngineeringTechnologyCenter,SouthwestUniversityofScienceandTechnology,Mianyang621010,China;2.SchoolofMaterialsandChemistry,SouthwestUniversityofScienceandTechnologyMianyang621010,China)Abstract:V-5Cr-5Tialloyisoneofthemaincandidatestructuralmaterialsforthefirstcladdingofnuclearfusionreactor,butthetheoreticalresearchisrelativelyfewonitsmechanicalproperties.Inthispaper,theelas-ticconstants,bulkmodulus,shearmodulus,Young'smodulus,Poisson'sratioandCauchypressureofV-5Cr-5Tialloyarecalculatedbyusingtherandomsolidsolutionmodelandthefirst-principlemethod,andcom-paredwiththecalculatedcorrelationvaluesofpurevanadium.TheresultsshowthatV-5Cr-5Tialloyhasgoodplasticityandstrength,butitsplasticityisslightlylowerthanthatofpurevanadium.TheresultsshowthattheplasticityandstrengthofV-5Cr-5Tialloyarereducedinvaryingdegreesduetotheadditionofoxygenatom.Finally,thetheoreticalstrengthsofV-5Cr-5Tialloyandpurevanadiumarecalculated,a...