对挤压态Mg-10Li-3AL-1Zn-0.3Mn合金进行了不同温度的固溶和时效处理,通过OM、XRD以及硬度测试,分析了合金的显微组织及力学性能的变化。结果表明,挤压态合金组织由α-Mg相、β-Li相以及MgLiAl2相组成,α-Mg相呈大小不等的块状分布在合金中,硬度较低(46.8 HV)。在不同温度下分别固溶30 min后,均发生α相固溶。随着固溶温度升高,α相的固溶程度增大,合金的硬度逐渐提高,在460℃固溶后合金硬度(HV)最高为110,与挤压态合金相比提高了135%;在460℃分别固溶30、60和90 min,发现随着固溶时间增加,硬度下降。时效后合金硬度降低,在70℃时效1 h和人工时效20天后,硬度(HV)最终均稳定在75左右,较挤压态提高约60%。
Abstract
An as-extruded Mg-10Li-3Al-1Zn-0.3Mn alloy was treated by solution and aging at different temperatures. The microstructure and mechanical properties of the alloy were analyzed by OM, XRD and hardness testing. The results show that the as-extruded alloy is composed of α-Mg, β-Li and MgLiAl2 phase. α-Mg phase is distributed in the alloy in blocks of different sizes with low hardness (46.8 HV). The hardness of the alloy is increased gradually with the increase of solution temperature. α-Mg phase is dissolved into the matrix alloy with solid solution at different temperatures for 30 min, and the hardness of the alloy is increased with increasing of solution temperature which result in the increase of α-Mg phase solution. The hardness of the alloy reaches up to 110 HV after solution at 460℃ for 30 min, which is 135% higher than that of extruded alloy. The hardness of the alloy is decreased with the increase of solution time at 460℃ for 30,60 and 90 min. After artificial aging and natural aging, the hardness of the alloy is decreased. After aging at 70℃ for 1 hour or artificial aging for 20 days, the hardness of the alloy is finally stabilized at about 75 HV, which is about 60% higher than that of the extruded alloy.
关键词
镁锂合金 /
固溶时效 /
显微组织 /
力学性能
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Key words
Mg-Li Alloy /
Solution and Aging /
Microstructure /
Mechanical Properties
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脚注
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基金
河南省高校科技创新团队资助项目(18IRTSTHN005);河南工程学院博士基金资助项目(D2017015)
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