微量Sr和Mn对Mg-8Li-3Al变形合金力学性能的影响*

doi:10.11901/1005.3093.2014.165

材料研究学报

2014, Vol. 28

Issue (9): 649-655 DOI: 10.11901/1005.3093.2014.165

本期目录 | 过刊浏览

微量Sr和Mn对Mg-8Li-3Al变形合金力学性能的影响*

许天才¹,彭晓东^1,²(

),张宝¹,魏国兵¹,陈元芳^1,³,姜军伟¹

1. 重庆大学材料科学与工程学院重庆 400045
2. 重庆大学国家镁合金材料工程技术研究中心重庆 400044
3. 重庆理工大学材料科学与工程学院重庆 400054

Effects of Minor Addition of Sr and Mn on Mechanical Properties of Micro-alloying Mg-8Li-3Al Wrought Alloy

Tiancai XU¹,Xiaodong PENG^1,^2,^**(

),Bao ZHANG¹,Guobing WEI¹,Yuanfang CHEN^1,³,Junwei JIANG¹

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400045
2. Engineering Research Center for Mg Alloys, Chongqing University, Chongqing 400044
3. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054

引用本文:

许天才,彭晓东,张宝,魏国兵,陈元芳,姜军伟. 微量Sr和Mn对Mg-8Li-3Al变形合金力学性能的影响*[J]. 材料研究学报, 2014, 28(9): 649-655.
Tiancai XU, Xiaodong PENG, Bao ZHANG, Guobing WEI, Yuanfang CHEN, Junwei JIANG. Effects of Minor Addition of Sr and Mn on Mechanical Properties of Micro-alloying Mg-8Li-3Al Wrought Alloy[J]. Chinese Journal of Materials Research, 2014, 28(9): 649-655.

全文: PDF(8154 KB) HTML

摘要:

用光学显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)和电子万能试验机对比研究了微量添加Sr和Mn对Mg-8Li-3Al合金组织和力学性能的影响, 结果表明: 基础合金Mg-8Li-3Al主要由α-Mg, β-Li和Al₁₂Mg₁₇金属间化合物组成, Sr和Mn的加入使合金中形成了Al₄Sr和Al₂Mn₃等金属间化合物。合金元素Sr和Mn对合金组织均有细化效果, Sr的细化效果优于Mn。添加Sr和Mn后合金的强度均有所提高, 其中挤压态Mg-8Li-3Al-0.5Sr-0.5Mn合金的σ_b= 242.15 MPa, σ_0.2= 206.96 MPa, δ = 22.43%, 比Mg-8Li-3Al镁合金的力学性能分别提高了14.98%, 28.11%和8.31%。

关键词 ：金属材料, 镁锂合金, Sr和Mn, 微观组织, 力学性能

Abstract：

The effect of minor addition of Sr and/or Mn on the microstructure and mechanical properties of the wrought Mg-8Li-3Al alloy were investigated by means of optical microscopy, scanning electron microscopy, X-ray diffraction studies, and tensile tests to reveal the variations in microstructures and mechanical behavior during processing. The results show that the alloy of Mg-8Li-3Al mainly consists of α-Mg, β-Li phases and Al₁₂Mg₁₇ intermetallic compound. Sr and Mn addition results in the precipitation of Al₄Sr and Al₂Mn₃. The microstructure of the alloy is refined with the addition of Sr and Mn, respectively. Moreover, the refining effect of Sr is better than Mn at the same mass fraction addition. The tensile strength of the alloys is improved with the addition of Sr and Mn. The tensile strength, yield stress and elongation of Mg-8Li-3Al-0.5Sr-0.5Mn alloy after extrusion are 242.15 MPa, 206.96 MPa and 22.43%, which are increased by 14.98%, 28.11% and 8.31% respectively in comparison with the those of the bare Mg-8Li-3Al alloy.

Key words： metallic material Mg-Li alloy Sr and Mn microstructure mechanical properties

收稿日期: 2014-04-03

基金资助:* 国家重点研究发展计划项目2007CB613702, 重庆市自然科学基金项目2008BB4323, 科技部国际合作项目2010DFR50010资助。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.165 或 https://www.cjmr.org/CN/Y2014/V28/I9/649

图1 铸态合金的金相组织

实验合金的化学成分(质量分数, %) 实验合金的化学成分(质量分数, %)

图2 铸态合金的XRD图谱

图3 铸态合金的SEM像和EDS能谱图

表2 图3中合金试样 EDS 微区成分(摩尔分数, %)

图4 挤压态合金金相组织

图5 挤压态合金的室温应力应变曲线

图6 挤压态合金拉伸断口的SEM像

表3 基体与金属间化合物潜在匹配位面的错配度值

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