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利用快速凝固和往复挤压制备细晶ZK60合金,并研究合金的组织与力学性能。结果表明,快速凝固薄带晶粒尺寸为1~8μm,2道次往复挤压后,合金晶粒尺寸为3μm,大量10~50 nm的颗粒从基体析出。随着挤压道次增加,沉淀颗粒增多,晶粒未进一步细化;2道次挤压后,合金抗拉强度高达319 MPa;屈服强度随挤压道次增加而增加,经6道次挤压,屈服强度为253 MPa,伸长率和硬度随挤压道次增加变化不大,分别为(7±1)%和(77±1)HV5。力学性能好归因于晶粒细化和弥散分布在基体上细小颗粒的强化作用。
Preparation of fine grain ZK60 alloy by rapid solidification and reciprocating extrusion and study of the microstructure and mechanical properties of the alloy. The results show that the grain size of the rapidly solidified ribbon is 1 ~ 8μm, and after 2 times of reciprocating extrusion, the grain size of the alloy is 3μm. A large number of 10 ~ 50 nm particles are precipitated from the matrix. With the increase of the extrusion pass, the precipitated particles increased and the grain did not further refine. After 2 passes, the tensile strength of the alloy reached as high as 319 MPa. The yield strength increased with the increase of the extrusion pass, The compressive yield strength was 253 MPa, while the elongation and hardness did not change much with the increase of squeezing pass, which were (7 ± 1)% and (77 ± 1) HV5, respectively. Good mechanical properties due to grain refinement and dispersion in the matrix of small particles on the strengthening effect.