等温锻造Mg-10Gd-2Y-0.5Zn-0.3Zr稀土镁合金组织性能
发布时间:2018-06-13 19:09
本文选题:等温锻造 + 时效工艺 ; 参考:《航空材料学报》2015年06期
【摘要】:利用金相显微镜、扫描电子显微镜和透射电子显微镜对原始锻态、等温锻造和时效处理后Mg-10Gd-2Y-0.5Zn-0.3Zr合金的微观组织进行分析研究。结果表明:等温锻造合金晶粒相对于原始锻态合金细化不明显,但大量的第二相在基体中的弥散析出是等温锻造合金强度略有上升的主要原因;合金在200℃时效过程中,随着时效时间的延长,越来越多细小颗粒及层片状强化相在基体中析出,其最优的时效工艺为200℃/60h;峰值时效合金的抗拉强度、屈服强度和伸长率分别为379 MPa、245 MPa和4.6%;β'相和长周期相(long period stacking order,LPSO)的大量弥散地在基体中析出是峰值时效合金的主要强化机制。
[Abstract]:The microstructure of Mg-10Gd-2Y-0.5Zn-0.3Zr alloy after original forging, isothermal forging and aging treatment was studied by metallographic microscope, scanning electron microscope and transmission electron microscope. The results show that the grain size of the isothermal forging alloy is less than that of the original forging alloy, but the main reason for the slight increase of the strength of the isothermal forging alloy is the dispersion precipitation of a large number of the second phases in the matrix, and the strength of the isothermal forging alloy increases slightly during aging at 200 鈩,
本文编号:2015094
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