CAJ | 학술논문

通过合金制备、微观分析和力学性能测试等方法研究了Y、Gd 复合稀土对ZA63镁合金组织和力学性能的影响.结果表明,添加适量RE元素后,ZA63合金中的τ相由半连续网状分布转变为针状或棒状且分布较均匀,ε相由岛状变为细小颗粒状,部分RE元素固溶于τ相中形成Mg-Al-Zn-RE相.随着RE含量的增加,经T6处理后的合金在室温、150 ℃和175 ℃下的抗拉强度和伸长率基本都呈先升高后降低的趋势.当RE含量为1.5%时,合金在3个温度下的抗拉强度和伸长率都达到最大值.
통과합금제비、미관분석화역학성능측시등방법연구료Y、Gd 복합희토대ZA63미합금조직화역학성능적영향.결과표명,첨가괄량RE원소후,ZA63합금중적τ상유반련속망상분포전변위침상혹봉상차분포교균균,ε상유도상변위세소과립상,부분RE원소고용우τ상중형성Mg-Al-Zn-RE상.수착RE함량적증가,경T6처리후적합금재실온、150 ℃화175 ℃하적항랍강도화신장솔기본도정선승고후강저적추세.당RE함량위1.5%시,합금재3개온도하적항랍강도화신장솔도체도최대치.
Effects of RE elements Y and Gd on microstructure and mechanical properties of ZA63 magnesium alloy were investigated by alloy preparation, microstructural analysis and tensile testing. The results reveal that with appropriate RE element Y and Gd addition, τ-phase in the ZA63 alloy is converted from semi-continuous network structure into needle-like or rod-like structure with more homogeneous distribution, in which Mg-Al-Zn-RE phase is formed as a result of some RE solution, and ε-phase is converted from island shape into fine particle. With increasing in RE addition, the tensile strength and elongation of the alloy after T6 treatment exhibit firstly increased and then decreased at room temperature, 150℃, and 175℃. Maximum value of tensile strength and elongation of the alloy at room temperature, 150℃, and 175℃ can be observed with 1.5% RE addition.