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微量稀土元素Sc对挤压态LAZ431合金显微组织及力学性能的影响

发表时间:2017-12-29  浏览量:1187  下载量:149
全部作者: 付坤宁,左佳岩,巫瑞智,侯乐干,张景怀,张密林
作者单位: 哈尔滨工程大学材料科学与化学工程学院
摘 要: 通过在Mg-Li-Al-Zn 合金中添加0~0.15%(质量分数)的Sc,研究Sc 元素对挤压态Mg-4Li-3Al-1Zn合金显微组织和力学拉伸性能的影响,以期制备一种高强高韧的超轻镁锂合金。研究表明,Mg-4Li-3Al-1Zn合金经挤压变形后,发生了动态再结晶,Sc 的加入使合金中生成Al3Sc,其弥散分布于合金基体内,并能够有效细化合金晶粒组织。随着Sc 含量的增加,AlLi 相逐渐减少,当Sc 含量为0.10%时,合金的抗拉强度达到最高值(282 MPa),同时,延伸率也达到最高值(27.6%)。
关 键 词: 金属材料;镁锂合金;Sc;挤压;显微组织;力学性能
Title: Effect of trace rare earth element Sc on microstructure and mechanical properties of LAZ431 alloy after extrusion
Author: FU Kunning, ZUO Jiayan, WU Ruizhi, HOU Legan, ZHANG Jinghuai, ZHANG Milin
Organization: College of Materials Science and Chemical Engineering, Harbin Engineering University
Abstract: 0-0.15% (mass fraction) Sc was added into the Mg-Li-Al-Zn alloy to study the influence of Sc on microstructure and mechanical properties of the alloy to prepare a kind of ultralight Mg-Li alloy with high strength and toughness. The results show that dynamic recrystallization happens in Mg-4Li-3Al-1Zn alloy after extrusion. With the addition of Sc, the Al3Sc phase forms and distributes in grains, which can effectively refine the microstructure of the alloy. The addition of Sc effectively reduces the content of AlLi phases. When the content of Sc is 0.10%, the alloy possesses the highest tensile strength and elongation, 282 MPa and 27.6%, respectively.
Key words: metallic materials; Mg-Li alloy; Sc; extrusion; microstructure; mechanical properties
发表期数: 2017年12月第24期
引用格式: 付坤宁,左佳岩,巫瑞智,等. 微量稀土元素Sc对挤压态LAZ431合金显微组织及力学性能的影响[J]. 中国科技论文在线精品论文,2017,10(24):2728-2733.
 
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