CAJ | 학술논문

用OM,SEM,TEM和电子万能试验机对不同方法制备的ZK60镁合金薄带的组织和力学性能进行了研究.常规铸造ZK60镁合金轧制后仍为等轴晶组织,晶粒尺寸明显细化,双辊铸轧ZK60镁合金条带温轧变形后,显微组织由树枝晶转变为纤维状变形组织,且有高密度剪切带产生,温轧过程中没有明显的动态再结晶发生.轧制后两种合金均具有良好的力学性能,轧制态铸轧合金的强度明显高于传统铸造合金,伸长率略低于传统铸造合金.退火热处理后两种合金均发生了再结晶,得到等轴晶组织,且铸轧合金的组织比传统铸造合金的组织更加均匀细小.退火热处理使薄带的强度略有下降,而伸长率大幅度提高,退火后双辊铸轧合金和传统铸造合金的抗拉强度、屈服强度和延伸率分别为:388 MPa,301 MPa,22.9％和311MPa,219 MPa,19.3％.镁合金薄带制备过程的晶粒细化归因于剪切带、位错和挛晶的产生及后续退火过程中再结晶.
용OM,SEM,TEM화전자만능시험궤대불동방법제비적ZK60미합금박대적조직화역학성능진행료연구.상규주조ZK60미합금알제후잉위등축정조직,정립척촌명현세화,쌍곤주알ZK60미합금조대온알변형후,현미조직유수지정전변위섬유상변형조직,차유고밀도전절대산생,온알과정중몰유명현적동태재결정발생.알제후량충합금균구유량호적역학성능,알제태주알합금적강도명현고우전통주조합금,신장솔략저우전통주조합금.퇴화열처리후량충합금균발생료재결정,득도등축정조직,차주알합금적조직비전통주조합금적조직경가균균세소.퇴화열처리사박대적강도략유하강,이신장솔대폭도제고,퇴화후쌍곤주알합금화전통주조합금적항랍강도、굴복강도화연신솔분별위:388 MPa,301 MPa,22.9％화311MPa,219 MPa,19.3％.미합금박대제비과정적정립세화귀인우전절대、위착화련정적산생급후속퇴화과정중재결정.
The microstructure and mechanical properties of ZK60 alloy sheet produced by different method were investigated using OM,SEM,TEM and a standard universal testing machine.The results show that,for conventional casting (CC) alloy,the equiaxed structure is refined after warm rolling.But for twin roll casting alloy,the microstructure changes from dendrite to fibrous deformed structure after warm rolling.Relatively higher density of shear bands can be observable in TRC ZK60 alloy sheet and no obvious dynamic recrystallization has been found after warm rolling.After warm rolling,the two alloys possess good mechanical properties,and the strength of TRC alloy is much higher than that of CC alloy,and elongation of TRC alloy is a little lower than that of CC alloy.The annealing heat treatment after warm rolling will induce a little decrease of strength and great increase of elongation of the two alloys.The tensile strength,yield strength and elongation of TRC and CC alloy sheet are 388 MPa,301 MPa,22.9％,and 311 MPa,219 MPa,19.3％,respectively.The grain refinement during manufacturing processes is attributed to the formation of heavy shear bands,high density dislocation,twins,and the recrystallization during subsequent annealing process.