CAJ | 학술논문

采用光学显微镜及拉伸试验机等手段,研究了Zr含量对Mg-5Zn-2Al合金铸态和热处理后显微组织及力学性能的影响.结果表明,Zr的加入使Mg-5Zn-2Al镁合金的铸态和热处理后的晶粒得到明显的细化.在铸态及热处理条件下,合金的抗拉强度与伸长率均呈现先上升后下降的变化趋势.对于铸态合金而言,Zr含量为0.6%时,Mg-5Zn-2Al合金的晶粒最为细小,并且其抗拉强度与伸长率均达到最大值,为215 MPa和12.563%.经热处理后,合金的抗拉强度较铸态得到了显著地提高.当Zr含量为0.6%时,合金的抗拉强度达到最大,为249 MPa.
채용광학현미경급랍신시험궤등수단,연구료Zr함량대Mg-5Zn-2Al합금주태화열처리후현미조직급역학성능적영향.결과표명,Zr적가입사Mg-5Zn-2Al미합금적주태화열처리후적정립득도명현적세화.재주태급열처리조건하,합금적항랍강도여신장솔균정현선상승후하강적변화추세.대우주태합금이언,Zr함량위0.6%시,Mg-5Zn-2Al합금적정립최위세소,병차기항랍강도여신장솔균체도최대치,위215 MPa화12.563%.경열처리후,합금적항랍강도교주태득도료현저지제고.당Zr함량위0.6%시,합금적항랍강도체도최대,위249 MPa.
Effects of Zr contents on microstructure and mechanical properties of as-cast and in heat treated Mg-5Zn-2AI magnesium alloy were investigated byOM (optical microscope) and tensile testing machine. The results verify that grain size in as-cast and in heat treated Mg-5Zn-2AI alloy can be remarkably refined with Zr addition. The tensile strength and elongation of the as-cast and heat treated alloy are firstly in-creased and then decreased. With 0. 6% Zr addition, the desirable grain size in the as-cast alloy can be ob-served, and the tensile strength and elongation reach 215MPa and 12. 563%, respectively. Compared with that of as-cast alloy, the tensile strength of the heat treated alloy is greatly improved with different Zr ad-ditions. With 0. 6% Zr addition, the tensile strength of the heat treated alloy reaches 249MPa.