利用DSC、X射线衍射(XRD)、透射电镜(TEM)和能谱分析研究了快速凝固Al-5Zn-2.5Mg-2.5Mn(质量分数)合金急冷态和退火态的显微组织,同时测定了该合金的硬度.DSC曲线有四个放热峰,位于90～110℃、260℃、460℃和480℃,它们分别对应于η相(MgZn2)、T相(Al2Mg3Zn3)、Al3Mn相和Al6Mn相的析出或转变,分析结果与XRD和TEM分析一致.研究还表明:快凝合金急冷态组织为过饱和Al基固溶体,无其它相存在;快凝合金经300℃×1h处理后,出现η和T相,此时无Al-Mn相出现;快凝合金经500℃×1h处理后,出现了Al-Mn弥散相,而η和T相溶入固溶体,Al的点阵常数和合金硬度变化验证了上述显微组织的演化过程.随着Al-Mn相的析出或转变,合金硬度显著提高.
参考文献
| [1] | J. C. Werenskiold;A. Deschamps;Y. Brechet .Characterization and modeling of precipitation kinetics in an Al-Zn-Mg alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2000(1/2):267-274. |
| [2] | Ronnig B;Ryum N .Constitute relationship for Al-Zn-Mg,Al-Zn-Mg-Cr and Al-Zn-Mg-Zr alloys[J].Metallurgical and Materials Transactions,2001,32:779-776. |
| [3] | Eto T.;, .Effect of dispersoids size on low temperature softening of work hardened ALMn~Mg aluminum alloys[J].軽金属,2000(6):272-275. |
| [4] | Czurratis P;Komgiebel E .The effect of additions of Mn and Cr and the applied solidification technique on the structure of an Al-2.2at% Zn-1.4at% Mg alloy[J].Physica Status Solidi,1988(108):171-182. |
| [5] | 苏勇,陈翌庆,丁厚福,黄新民.快速凝固Al-Cr-Zr-Ti合金的显微组织[J].稀有金属,2001(03):166-169. |
| [6] | Chang J;Moon I;Choi C .Evolution of microstructure and tensile strength of rapidly solidified Al-4.7pct Zn-2.5pct Mg-0.2pct Zr-X wt pct Mn alloys[J].Metallurgical and Materials Transactions,1998,29:1873-1881. |
| [7] | 马图哈K H.非铁合金的结构与性能[M].北京:科学出版社,1999:226-227. |
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