Effect of hot extrusion on structure and properties of YAl2p/Mg-14Li-3Al composites
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摘要:
利用搅拌铸造法制备出不同体积分数的YAl2p/Mg-14Li-3Al复合材料,然后将其挤压成薄壁管材,通过金相显微镜、扫描电镜和万能试验机等手段研究了热挤压变形对复合材料显微组织及力学性能的影响。结果表明,通过热挤压变形,YAl2p增强体的分散性得到改善,复合材料的显微组织明显细化,力学性能显著提升。其中挤压态体积分数为1%的YAl2p/Mg-14Li-3Al复合材料与铸态相比,抗拉强度和屈服强度均提高了60%以上,塑性得到改善。在挤压的过程中,复合材料的挤压力峰值与Mg-14Li-3Al合金相比略有增加,且挤压力峰值达到的时间存在滞后的现象。
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关键词:
- 热挤压 /
- Mg-Li-Al基复合材料 /
- YAl2p /
- 显微组织 /
- 力学性能
Abstract:YAl2p/Mg-14Li-3Al composites with different volume fraction were fabricated by stir casting, and then the as-cast ingots were extruded as composite thin-walled tubes with the defined experimental parameters. Effects of hot extrusion deformation on microstructure and mechanical properties of YAl2p/Mg-14Li-3Al composites were investigated by optical microscope, scanning electronic microscope, tensile tests and so on. The results show that hot extrusion deformation can effectively improve the YAl2p distribution and the mechanical properties of the composites. In addition, the grains of matrix are significantly refined after hot extrusion. For as-extruded YAl2p/Mg-14Li-3Al composites with volume fraction of 1%, compared with as-cast condition, the tensile strength and the yield strength are both improved by over 60%, and the ductility is improved. In the process of hot extrusion, the extrusion pressure peak of the composite is improved slightly compared with Mg-14Li-3Al alloy, and the time of the peak pressure of the composite lags behind the alloy.
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Key words:
- hot extrusion /
- Mg-Li-Al matrix composites /
- YAl2p /
- microstructure /
- mechanical property
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表 1 LA143镁合金的主要化学成分
Table 1. Main chemical composition of LA143 magnesium alloy
元素 Li Al Ca Ce Fe Mn Mg 质量分数/% 13.6 2.7 0.016 0.019 0.048 0.025 83.292 -
[1] TROJANOVA Z, DROZD Z, KUDELA S, et al.Strengthening in Mg-Li matrix composites[J].Composites Science and Technology, 2007, 67(9):1965-1973. doi: 10.1016/j.compscitech.2006.10.007 [2] KUDELA S.Magnesium-lithium matrix composites[J].International Journal of Materials and Product Technology, 2003, 18(13):91-115. https://www.deepdyve.com/lp/inderscience-publishers/magnesium-lithium-matrix-composites-an-overview-7ojRNSqKmb [3] RAWAL S P.Metal-matrix composites for space applications[J].The Journal of the Minerals Metals and Materials Society, 2001, 53(4):14-17. doi: 10.1007/s11837-001-0139-z [4] 秦径为, 彭谦之, 周海涛, 等.Mg-8Li-3Al-Y镁锂合金板材热轧及退火组织与性能[J].稀有金属, 2015, 39(7):577-582. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=zxjs201507001&dbname=CJFD&dbcode=CJFQQIN J W, PENG Q Z, ZHOU H T, et al.Microstructure and mechanical properties of hot-rolled and annealed Mg-8Li-3Al-Y alloys[J].Chinese Journal of Rare Metals, 2015, 39(7):577-582(in Chinese). http://kns.cnki.net/KCMS/detail/detail.aspx?filename=zxjs201507001&dbname=CJFD&dbcode=CJFQ [5] LI N, ZHANG Q Q, NIU L Y, et al.Microstructure, properties and application of YAl2 intermetallic compound as particle reinforcement[J].Materials Science and Engineering:A, 2014, 617:139-145. doi: 10.1016/j.msea.2014.08.047 [6] SHOROWORDI K M, LAOUI T, HASEEB A S M A, et al.Microstructure and interface characteristics of B4C, SiC and Al2O3 reinforced Al matrix composites:A comparative study[J].Journal of Materials Processing Technology, 2003, 142(3):738-743. doi: 10.1016/S0924-0136(03)00815-X [7] AMOURI K, KAZEMI S, MOMENI A, et al.Microstructure and mechanical properties of Al-nano/micro SiC composites produced by stir casting technique[J].Materials Science and Engineering:A, 2016, 674:569-578. doi: 10.1016/j.msea.2016.08.027 [8] ZHANG X, WU G Q, LING Z H A, et al.Novel method to control agglomeration of ultrafine YAl2 particles in YAl2p/MgLiAl composites[J].Materials Letters, 2011, 65(1):104-106. doi: 10.1016/j.matlet.2010.09.028 [9] SAJJADI S A, EZATPOUR H R, BEYGI H.Microstructure and mechanical properties of Al-Al2O3 micro and nano composites fabricated by stir casting[J].Materials Science and Engineering:A, 2011, 528:8765-8771. doi: 10.1016/j.msea.2011.08.052 [10] AYYAR A, CHAWLA N.Microstructure-based modeling of the influence of particle spatial distribution and fracture on crack growth in particle-reinforced composites[J].Acta Materialia, 2007, 55(18):6064-6073. doi: 10.1016/j.actamat.2007.06.044 [11] CHEN J, BAO C, CHEN F.Evolutions of microstructure and mechanical properties for Mg-Al/AlN composites under hot extrusion[J].Materials Science and Engineering:A, 2016, 667:426-434. doi: 10.1016/j.msea.2016.05.033 [12] CHANG H, WANG X, HU X, et al.Effects of reinforced particles on dynamic recrystallization of Mg base alloys during hot extrusion[J].Rare Metal Materials and Engineering, 2014, 43(8):1821-1825. doi: 10.1016/S1875-5372(14)60138-7 [13] QI G, FANG C, BAI Y, et al.Effect of hot extrusion on microstructures and properties of TiB2/AZ31 magnesium based composites[J].Rare Metal Materials and Engineering, 2011, 40(8):1339-1343. doi: 10.1016/S1875-5372(11)60053-2 [14] 中华人民共和国国家质量监督检验检疫总局, 中国标准化管理委员会. 金属材料拉伸试验第1部分: 室温试验方法: GB/T 228. 1-2010[S]. 北京: 中国标准出版社, 2010.General Administration of Quality Supervision, Standardization Administration of China. Metallic materials-Tensile testing-Part 1:Method of test at room temperature:GB/T 228.1-2010[S].Beijing:China Standards Press, 2010(in Chinese). [15] HASHIM J, LOONEY L, HASHMI M S J. Particle distribution in cast metal matrix composites-part Ⅰ[J].Journal of Materials Processing Technology, 2002, 123(2):251-257. doi: 10.1016/S0924-0136(02)00098-5 [16] FU H M, ZHANG M X, QIU D, et al.Grain refinement by AlN particles in Mg-Al based alloys[J].Journal of Alloys and Compounds, 2009, 478(1-2):809-812. doi: 10.1016/j.jallcom.2008.12.029 [17] CHEN T J, JIANG X D, MA Y, et al.Grain refinement of AZ91D magnesium alloy by SiC[J].Journal of Materials Science, 2010, 496(1-2):218-225. https://www.sciencedirect.com/science/article/pii/S0925838810004561