組織與力學性能的影響
(中南大學 材料科學與工程學院，長沙 410083)
摘 要: 采用硬度檢測、拉伸實驗、金相分析、TEM分析等方法測試和分析了ZK60合金在鑄態(tài)、擠壓態(tài)、固溶態(tài)及T5和T6時效態(tài)下的硬度、強度和顯微組織等。結果表明：ZK60鎂合金在塑性變形和不同熱處理狀態(tài)下硬度和強度等力學性能變化明顯。經(jīng)過擠壓和T5熱處理后，ZK60合金的硬度和強度都大幅度提高。ZK60合金擠壓后進行T5處理，其強度要比T6處理的強度明顯要高，這與T5狀態(tài)下合金中析出強化相分布更加密集和細小有關，T6熱處理時，由于第二相尺寸以及相互間距都較大，因此強化效果反而不如T5狀態(tài)。
關鍵字: ZK60鎂合金；固溶處理；時效；擠壓；力學性能
mechanical properties of ZK60 magnesium alloy
（School of Materials Science and Engineering, Central South University,Changsha 410083, China）
Abstract:The hardness test, tensile test and microstructure analysis were used to investigate the properties and structure variation of ZK60 alloy in as-cast, extrusion, solid solution and aging states. The results show that the hardness and strength of ZK60 alloy increase obviously after extrusion and T5 treatment. The hardness and strength of ZK60 alloy under T5 condition are higher than those under T6 condition because the second phase precipitated during the aging process is finer and more dispersive under T5 condition than that under T6 condition. The dispersed precipitated phase and dislocations under T5 condition lead to higher mechanical properties for ZK60 alloy.
Key words: ZK60 magnesium alloy; solid solution; aging; extrusion; mechanical properties
