[1]曹富荣,夏飞.超轻Mg-9.3Li-1.79Al-1.61Zn镁锂合金力学性能与组织演变 [J].中国材料进展,2019,(02):187-192.
 CAO Furong,XIA Fei.Mechanical Properties and Microstructural Evolution of a Superlight Mg-9.3Li-1.79Al-1.61Zn Alloy [J].MATERIALS CHINA,2019,(02):187-192.
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超轻Mg-9.3Li-1.79Al-1.61Zn镁锂合金力学性能与组织演变

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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2019年第02期
页码:
187-192
栏目:
研究报告
出版日期:
2019-02-28

文章信息/Info

Title:
Mechanical Properties and Microstructural Evolution of a Superlight Mg-9.3Li-1.79Al-1.61Zn Alloy

作者:
曹富荣夏飞
东北大学材料科学与工程学院,辽宁 沈阳

Author(s):
CAO FurongXIA Fei
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

关键词:
Mg-Li合金轧制力学性能显微组织
Keywords:
magnesium-lithium alloy rolling mechanical property microstructure
文献标志码:
A
摘要:
为了提高Mg-Li合金的强度和塑性,通过铸造和轧制方法制备了新型Mg-9.3Li-1.79Al-1.61Zn合金板材,采用光学显微镜、X射线衍射仪(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、显微硬度计与拉伸试验机研究了合金的显微组织和力学性能。维氏显微硬度测试发现冷轧态的硬度最高。拉伸试验获得冷轧合金的延伸率为24%,抗拉强度为209 MPa。光学组织研究确定热轧组织为带状晶粒组织;冷轧板573 K 经1 h退火后,并未发生完全再结晶。通过取向分布(ODF)函数分析热轧、冷轧和退火过程形成的织构,发现βLi相比αMg相产生了更多的织构分量,但是织构强度相对较低。TEM观察发现变形组织中Al2Mn相、退火组织中AlLi相的存在。XRD分析进一步证实了退火组织中存在AlLi相。SEM断口分析表明合金的断裂形式为韧性断裂。力学性能结果与显微组织演变一致。

Abstract:
To improve the strength and ductility of Mg-Li alloy, sheets of a novel Mg-9.3Li-1.79Al-1.61Zn alloy were produced by casting and rolling. The microstructures and mechanical properties of the alloy were investigated by optical microscope, Xray diffractometer (XRD), transmission electron microscope (TEM), scanning electron microscope(SEM), microhardness tester and tensile tester. Microhardness tests reveal that the hardness of the coldrolled sheet reaches the highest value. Tensile tests show that the elongation to failure of 24% and the ultimate tensile strength of 209 MPa were obtained in the coldrolled alloy. Optical microstructural examination exhibits that hotrolled microstructures are composed of banded or elongated grains. After annealing at 573 K for 1 h for the coldrolled sheet, the alloy is in a partially recrystallized state. Oriental distribution function (ODF) maps were used to analyze the textures of duplex phases formed during hot rolling, cold rolling and annealing, we found that more texture components exist in the βLi phase than those of the αMg phase and the texture intensity of the βLi phase is relatively lower. TEM observations reveal the existence of Al2Mn phase in the tensile specimen and the existence of AlLi phase in the asannealed microstructure. XRD analysis further confirms the existence of the AlLi phases. SEM examination of the fracture surface of tensile specimen reveals that its fracture mode is a ductile fracture. Above mentioned results of mechanical properties are consistent with the microstructural evolution.


更新日期/Last Update: 2019-03-19