研究在不同挤压力下凝同的Al-Si-Cu-T4的显微组织和力学性能.结果表明:在挤压力下凝固时,该合金显微组织发生明显变化,其抗拉强度和伸长率均有明显提高.当挤压力为0.1～50 MPa时,随着挤压力的增加,初生a(Al)晶粒尺寸和共晶Si粒子长宽比均显著减小,Si相形貌由长针状变成粒状或圆棒状.同时,枝晶间距减小,Al2Cu相量和枝晶间孔洞数量减少,力学性能提高;而当挤压力为50～100 MPa时,挤压力的增加对合金显微组织和力学性能影响不大.因此,50 MPa为该合金的合适挤压力,在该条件下凝固的合金经T4热处理后,其抗拉强度和伸长率分别为323.6 MPa和8.51%.此外,分析讨论了不同挤压力下凝固的合金断口裂纹的形成.
参考文献
| [1] | 齐丕骧.国内外挤压铸造技术发展概况[J].特种铸造及有色合金,2002(02):20-23. |
| [2] | 罗守靖;陈炳光;齐丕骧.液态模锻与挤压铸造技术[M].北京:化学工业出版社,2007 |
| [3] | M. R. Ghomashchi;A. Vikhrov .Squeeze casting: an overview[J].Journal of Materials Processing Technology,2000(1/3):1-9. |
| [4] | Muzaffer Zeren;Erdem Karakulak .Influence of Ti addition on the microstructure and hardness properties of near-eutectic Al-Si alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2008(1/2):255-259. |
| [5] | ZHANG Ming,ZHANG Wei-wen,ZHAO Hai-dong,ZHANG Da-tong,LI Yuan-yuan.Effect of pressure on microstructures and mechanical properties of Al-Cu-based alloy prepared by squeeze casting[J].中国有色金属学会会刊（英文版）,2007(03):496-501. |
| [6] | 罗继相,白旭白,谌伟,潘欣.铝合金挤压铸造技术的研究与应用[J].铸造,2002(08):464-469. |
| [7] | 胡茂良,赵密,吉泽升,孙光滨,朴永吉.挤压铸造工艺对汽车空调器摇盘组织和性能的影响[J].中国有色金属学报,2006(03):400-405. |
| [8] | 齐丕骧,吴岳壹,齐霖.挤压铸造合金材料的研究进展[J].特种铸造及有色合金,2005(01):28-31. |
| [9] | Ammar HR;Samuel AM;Samuel FH .Effect of casting imperfections on the fatigue life of 319-F and A356-T6 Al-Si casting alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):65-75. |
| [10] | SUZUKI T;OSHIRON .High-strength aluminum alloy for casting,contains preset amounts of copper,silicon,magnesium,iron,phosphorus,antimony,aluminum and impurities[P].EP1371741-A2,2003-10-17. |
| [11] | YAMADA K;HATANO T;MIYAKAWA S;TAKAGI H,HORIKAWA H.HASHIMOTO A .Aluminum alloy casting,e.g.spiral scroll of compressor of air-conditioner,is obtained by casting aluminum alloy containing silicon,copper,magnesium,iron,manganese and aluminum,to which silver is added[P].JP2004091822-A,2002-8-29. |
| [12] | 龚磊清;金长庚;刘发信;李文林.铸造铝合金金相图谱[M].长沙:中南工业大学出版社,1987 |
| [13] | 胡德林;张帆.三元合金相图[M].西安:西北工业大学出版社,1995 |
| [14] | CHADWICH G A;YUE T M .Principles and applications of squeeze castings[J].Metallurgical and Materials Transactions,1989,5:6-12. |
| [15] | FRANKLIN J R;DAS A A .Squeeze casting-A review of the status[J].foundryman,1984,77(03):150-158. |
| [16] | Z. W. Chen .Skin solidification during high pressure die casting of Al-11Si-2Cu-1Fe alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):145-153. |
| [17] | CAMPBELL J.Castings[M].Oxford,UK:Butterworth-Heinemann,2003 |
| [18] | ZHU J D;COCKCROFT S L;MAIJER D M .Modeling of micropurosity formation in A356 aluminum alloy casting[J].Metallurgical & Materials Transactions A:Physical Metallurgy & Materials Science,2006,37:1075-1085. |
| [19] | PEQUET C;GREMAUD M;PAPPAZ M .Modeling of microporosity,macroporosity and pip-shrinkage formation during the solidification of alloys using a mushy-zone refinement method:application to aluminum alloys[J].Metallurgical and Materials Transactions A,2002,33:2095-2106. |
| [20] | KUBO K;PEHLKE R D .Mathematical modeling of porosity formation in solidification[J].Metallurgical and Materials Transactions B:Process Metallurgy and Materials Processing Science,1985,16:359-366. |
| [21] | SUKUMARAN K;RAVIKUMAR K K;PILLAI S G K .Studies on squeeze casting of A12124 alloy and 2124-10%SiCp metal matrix composite[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2008,490:235-241. |
| [22] | Kyuhong Lee;Yong Nam Kwon;Sunghak Lee .Effects of eutectic silicon particles on tensile properties and fracture toughness of A356 aluminum alloys fabricated by low-pressure-casting, casting-forging, and squeeze-casting processes[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2008(1/2):532-541. |
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