CAJ | 학술논문

研究了微观组织对ZL205A系铸造铝铜合金热处理后强度和塑性的影响.结果表明:影响该合金强度和塑性性能的微观组织主要是晶粒尺寸、品内、晶界沉淀相,弥散析出相和未同溶相.晶界处主要是θ相、N相、初生T相的混合组织.当呈针状或条状时恶化合金性能,当呈半连续的骨骼对合金性能影响较小.晶内细小弥散的二次T相是主要强化相,当T相聚集长大会降低强度.过剩相θ相,当呈大块分布时降低合金塑性,当呈细小均匀分布时对合金性能影响较小.
연구료미관조직대ZL205A계주조려동합금열처리후강도화소성적영향.결과표명:영향해합금강도화소성성능적미관조직주요시정립척촌、품내、정계침정상,미산석출상화미동용상.정계처주요시θ상、N상、초생T상적혼합조직.당정침상혹조상시악화합금성능,당정반련속적골격대합금성능영향교소.정내세소미산적이차T상시주요강화상,당T상취집장대회강저강도.과잉상θ상,당정대괴분포시강저합금소성,당정세소균균분포시대합금성능영향교소.
The influences of microstructure on strength and ductility of high strength cast Al-Cu alloy wih heat treatment were studied.The results show that the main factors which have an influence on the strength and plasticity of Al-Cu alloy are crystalline size,precipitated phases in grain boundary,and dispersed and undissolved phases.The microstructure of the grain boundary phase is mixture structure which consists of matrix,θ(Al_2Cu),a little N,and T (Al_(12)Mn_2Cu).The mixed phases with acicular shape can depress the mechanical performance of Al-Cu alloy,while the mixed phase with incontinuous skeleton profile can improve the mechanical properties of the alloy.The fine dispersed T phase in intracrystalline is one ofthe main strengthening phases for Al-Cu alloys,but which can decrease the strength of Al-Cu alloy when T phase aggregations or grain growth happens.The ductility of the alloy reduces when the undissolved θ phase presents block shape,however,the ductility is less influenced when the undissolved θ phase is finely distributed in matrix or grain boundary.