CAJ | 학술논문

研究添加Bi对AZ80镁合金铸态显微组织及力学性能的影响.结果表明:将Bi加入到Az80镁合金中后,粗大的β-Mg17Al12a离异共晶组织被细化并由连续网状分布变为断续状;晶界处和枝晶间出现具有六方D52结构的针状和颗粒状的Mg3Bi2相.力学性能测试结果表明:随着Bi含量的增加,抗拉强度和伸长率先升高再降低,AZ80-0.5%Bj合金的综合力学性能最优;当Bi含量超过1.0%(质量分数)时,针状相明显变多并粗化,加载时容易开裂而割裂基体,导致力学性能降低.
연구첨가Bi대AZ80미합금주태현미조직급역학성능적영향.결과표명:장Bi가입도Az80미합금중후,조대적β-Mg17Al12a리이공정조직피세화병유련속망상분포변위단속상;정계처화지정간출현구유륙방D52결구적침상화과립상적Mg3Bi2상.역학성능측시결과표명:수착Bi함량적증가,항랍강도화신장솔선승고재강저,AZ80-0.5%Bj합금적종합역학성능최우;당Bi함량초과1.0%(질량분수)시,침상상명현변다병조화,가재시용역개렬이할렬기체,도치역학성능강저.
The effects of Bi addition on the microstructures and mechanical properties of as-cast AZ80 alloy were investigated. The results show that with the addition of Bi, the coarse eutectic phases are refined and become discontinuous; some flaky and granular Mg3Bi2 phases with a hexagonal structure of D52 are observed along the grain boundaries and between dendrites. The tensile strength and elongation increase first, and then decrease with increasing Bi content. AZ80-0.5%Bi alloy has optimum combination mechanical properties. When the content of Bi is above 1.0% (mass fraction), the amount of flaky Mg3Bi2 phase increases markedly, which splits the matrix and deteriorates the tensile strength and elongation.