铸造2025，Vol.74Issue(12)：1566-1572,7.
铸挤一体化高强韧ZK60镁合金微观组织及力学性能研究
Microstructure and Mechanical Properties of High Strength-Toughness ZK60 Magnesium Alloy via Continuous Squeeze Casting-Extrusion Process
摘要
Abstract
The microstructure and mechanical properties of ZK60 alloy prepared by the squeeze casting and the continuous squeeze casting-extrusion have been studied.The results show that both squeeze casting and continuous squeeze casting-extrusion ZK60 alloys are mainly composed of α-Mg,MgZn2,and MgZn phases.The secondary phases exhibit fine lamellar,fragmented blocky,and granular morphologies,distributing along grain boundaries.After extrusion,they show streamline distribution and become finer and more dispersed.The average grain size of squeeze casting ZK60 alloy is 51.75 μm,while that of continuous squeeze casting-extrusion ZK60 alloy is 1.81 μm,with a distinct"bimodal structure"in the microstructure and a recrystallization fraction of 52.27％.Owing to grain boundary strengthening,secondary phase strengthening,and dislocation hardening,the tensile strength,yield strength,and elongation of the continuous squeeze casting-extrusion ZK60 alloy reach 349 MPa,321 MPa,and 18.5％,which were 78％,241％,and 144％ higher than those of the squeeze casting ZK60 alloy,respectively.The fracture morphology exhibits typical ductile fracture characteristics.关键词
ZK60合金/铸挤一体化/微观组织/力学性能/晶粒细化Key words
ZK60 alloy/continuous squeeze casting-extrusion/microstructure/mechanical property/grain refinement分类
矿业与冶金引用本文复制引用
郭文波,郭光辉,赵第甲,严兆祥,吕书林,吴树森..铸挤一体化高强韧ZK60镁合金微观组织及力学性能研究[J].铸造,2025,74(12):1566-1572,7.基金项目
国家自然科学基金资助(No.52175321). （No.52175321）
