超声振动下Sr对A380合金组织性能的影响

雷吉平; 余剑武; 李承波; 陈健美; 罗红

doi:10.3969/j.issn.1671-7775.2018.02.015

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江苏大学学报（自然科学版） ›› 2018, Vol. 39 ›› Issue (2) : 211-216. DOI: 10.3969/j.issn.1671-7775.2018.02.015

论文

超声振动下Sr对A380合金组织性能的影响

作者信息 +

Effects of Sr and ultrasonic vibration on microstructures and mechanical properties of ascast A380 alloy

Author information +

文章历史 +

摘要

超声振动作用下,添加质量分数(w(Sr))为0～0.25％的Sr，对A380合金进行变质处理,以研究Sr和超声振动对A380合金微观组织和力学性能的影响.结果表明:加入Sr与超声振动使A380合金组织显著细化,树枝晶αAl由粗大变为细小、呈球状,共晶Si相也由粗大针状变为蠕虫状、点状和纤维状;w(Sr)=0.15％时,对组织的细化效果最理想.只添加w(Sr)=0.15％的Sr时, A380合金铸态下抗拉强度(σb)、屈服强度(σ0.2)、伸长率(EL)和硬度分别为305 MPa,219 MPa,3.78％和106 BHN;w(Sr)=0.15％,且有超声振动作用时,σb,σ0.2,EL和硬度分别为318 MPa,227 MPa,3.99％和108 BHN,此时晶粒尺寸最小,约为42 μm,形状因子最大,为0.71.

Abstract

The effects of 0～0.25% Sr and ultrasonic vibration (UV) on microstructure and mechanical properties of A380 alloy were investigated. The results show that the microstructure in A380 alloy can be refined significantly, and the αAl phase are changed from coarse dendrite into fine nondirectional dendrites with globular structure, while the eutectic Si phase are changed from coarse acicular into vermicular, spot ones and fibrous. The desirable refinement of the microstructure in A380 alloy is obtained with 0.15% Sr. Tensile strength, yield strength, elongation and hardness of the ascast A380 with 0.15% Sr addition are 305 MPa, 219 MPa, 3.78% and 106 BHN, and those are respective 318 MPa, 227 MPa, 3.99% and 108 BHN under 0.15% Sr addition with UV. The smallest grain size is 42 μm, and the largest shape factor is 0.71 with 0.15% Sr addition under UV.

导出引用

雷吉平, 余剑武, 李承波, 等. 超声振动下Sr对A380合金组织性能的影响[J]. 江苏大学学报（自然科学版）, 2018, 39(2): 211-216 https://doi.org/10.3969/j.issn.1671-7775.2018.02.015

LEI Ji-Ping, YU Jian-Wu, LI Cheng-Bo, et al. Effects of Sr and ultrasonic vibration on microstructures and mechanical properties of ascast A380 alloy[J]. Journal of Jiangsu University(Natural Science Edition), 2018, 39(2): 211-216 https://doi.org/10.3969/j.issn.1671-7775.2018.02.015

参考文献

［1］JIAN X, MEEK T T, HAN Q. Refinement of eutectic silicon phase of aluminum A356 alloy using highintensity ultrasonic vibration［J］. Scripta Materialia, 2006, 54:893-896.
［2］ZUO X R,ZHONG Z G. Effect of united refining and modifieation on mechanical properties of A356 aluminium alloys［J］. Trans Nonferrous Met Soc China, 2006, 16:1419-1424.
［3］LIU Y, GENG C, ZHU Y K, et al. Effect of Sr addition on microstructure evolution and mechanical properties of Zn4％Al hypoeutectic alloy［J］. Journal of Alloys and Compounds, 2017,695: 443-451.
［4］熊俊杰,闫洪,揭小平. Sr变质对ADC12组织及性能的影响［J］.功能材料,2016, 47 (8):8104-8108.
XIONG J J,YAN H,JIE X P. Effect of Sr modification on structures and properties of ADC12［J］.Functional Materials, 2016, 47 (8):8104-8108. (in Chinese)
［5］PUGA H, BARBOSA J, COSTA S, et al. Influence of indirect ultrasonic vibration on the microstructure and mechanical behavior of AlSiCu alloy［J］.Materials Science ＆ Engineering A, 2013,560:589-595.
［6］李瑞卿,李晓谦,陈平虎,等. 超声铸造7085铝合金在热处理过程中的相变行为［J］.材料工程, 2016,43(6): 24-30.
LI R Q, LI X Q, CHEN P H, et al. Phase transformation behavior of ultrasonictreated 7085 aluminum alloy during heat treatment［J］. Journal of Materials Engineering,2016,43(6):24-30. (in Chinese)
［7］LI J W, MOMONO T, FU Y, et al. Effect of ultrasonic stirring on temperature distribution and grain refinement in Al1.65％Si alloy melt［J］. Trans Nonferrous Met Soc China, 2007,17: 691-697.
［8］徐红星,程晓农,许晓静,等. 超细亚晶粒铝合金的强化机理［J］.江苏大学学报(自然科学版),2011, 32 (1):51-55.
XU H X, CHENG X N, XU X J, et al. Strengthening mechanism of ultrafine subgrained Al alloy［J］. Journal of Jiangsu University(Natural Science Edition), 2011, 32 (1):51-55. (in Chinese)
［9］陈登斌,赵玉涛,祝海燕,等. 稀土钇及复合稀土对Al3Ti／7055复合材料微观组织的影响［J］.江苏大学学报(自然科学版), 2011, 32 (4):456-459.
CHEN D B,ZHAO Y T,ZHU H Y, et al. Effects of Y and multiple rare earth addition on microstructures of Al3Ti／7055 composites［J］. Journal of Jiangsu University(Natural Science Edition), 2011, 32 (4):456-459. (in Chinese)
［10］BARRIRERO J, LI J H, ENGSTLER M, et al. Cluster formation at the Si／liquid interface in Sr and Na modified AlSi alloys［J］. Scripta Materialia, 2016, 117:16-19.
［11］DU J, SHI Y T, ZHOU M C, et al. Effect of Sr on grain refinement of Mg3％Al alloy containing trace Fe by carboninoculation［J］. Journal of Materials Science ＆ Technology, 2016, 32:1297-1302.
［12］PRATHEESH K, RAVI M, KANJIRATHINKAL A, et al. Effects of Sr and pressure on microstructure, mechanical and wear properties of near eutectic AlSi piston alloys［J］. Int J Cast Metal Res, 2015, 28:301-309.
［13］BIROL Y. Grain refinement and modification of AlSi foundry alloys with B and Sr additions［J］. Mater Sci Tech, 2014, 30:1154-1161.