LARGE STRAIN DEFORMATION OF POLYCRYSTALLINE METALS AT LOW HOMOLOGOUS TEMPERATURES
LARGE STRAIN DEFORMATION OF POLYCRYSTALLINE METALS AT LOW HOMOLOGOUS TEMPERATURES
复制标题
DOI：
10.1016/0022-5096(75)90018-6
复制
发表时间：
1975-01-01
影响因子：
5.3
通讯作者：
SHERBY, OD
中科院分区：
文献类型：
--
作者：
HOCKETT, JE;SHERBY, OD
室温下多晶α U和α Fe的大应变压缩数据（真实应变约为-3.0）。这些结果以及在低同系温度（Tm = 0.2Tm）（Tm为绝对熔化温度）下发表的其它数据表明，在广泛的应变硬化后，α U接近稳态流变应力σ s。α U表现出很高的应变硬化速率，σs为2900 MPa（420 ksi），表明冷加工是强化这种金属的一种非常有效的方法。所有评估的数据都可以用应力-应变关系σ = σs− exp（−（Nε）p）（σs− σy）拟合，其中σ y是屈服应力，p是所分析金属的常数，等于a，N是与材料的应变硬化特性相关的常数，σ是真实应力，ε是真实应变。
Large straincompression data (true strains to about −3.0) are presented for polycrystalline α U and α Fe at room temperature. The results, together with other published data at low homologous temperatures (≈0.2Tm), whereTmis the absolute melting temperature, suggest that a steady-state flow stress σsis approached after extensive strain-hardening, α U exhibits a very high strain-hardening rate, with σs≈ 2900 MPa (420 ksi) indicating that cold-working is a very potent method of strengthening this metal. All the data evaluated can be fit by the stress-strain relation σ = σs− exp (−(Nε)p)(σs− σy), where σyis the yield stess,pis a constant equal to a for the metals analyzed,Nis a constant associated with the strain-hardening characteristics of a material, σ is true stress, and ε is true strain.