Research on High Strength Hypoeutectic Al-Si Alloy

Abstract:

In this study, hypoeutectic Al-Si casting alloy was investigated to obtain high strength, according to alloying of Cu Mg, refining of Al-5Ti-B master alloy, modifing of Re and T6 heat treatment. The experimental results show that the mechanical properties of the tested alloy reach peak when addition of Al-5Ti-1B alloy is 1.0% after heat treatment, especially the yield strength, correspondingly, microstructure distribution gets to the best state. When Al-5Ti-1B exceeds 1.0%, the mechanical properties descend gradually. The metallic compounds of Mg₂Si phase, CuA1₂ phase and W phase precipitated along the grain boundary and strengthened dispersively can improve mechanical properties of the tested alloys. The yield strength of samples added 0.1% Re (La 50%, Ce 40%) increases slightly, simultaneously, the tensile strength and elongation decreases. After 0.1% Re, the mechanical properties get down.

• Periodical: Advanced Materials Research (Volume 873)
• Pages: 10-18
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.873.10
• Online since: December 2013
• Authors: Ting Ting Jia*, Guo Shi Chen, Shuo Zhang, Ming Wu, Hao Ran Geng
• Keywords: Al-5Ti-1B, Hypoeutectic Al-Si Alloy, Mechanical Property, Re, T6 Heat Treatment

References

[1] Gao Rongxin, Wang Bailing, Wei Anjie. Status and Prospects on the Automobile Lightweight Technology(one-four)［J］. Auto. Engineer(in Chin. ), 2010( 1-4) : 17-23.

[2] Hu Zhong, Zhang Qixun. Casting technology and quality control of Aluminum and Magnesium alloys [M]. Beijing: Aeronautic Industry Press , 1990. 42-43.

[3] Tang Shunyi, Zhou Nianrun. General situation and development trend of the modification of the Al–Si casting alloys [J]．Journal of Zhejiang Metallurgy(in Chin. ), 2007, （2）：1-5.

[4] Yang Qijie, Su Guangcai, Wang Wenchao. Study on Compound Modification of Improved Al-Si Casting Alloy[J]. Hot Working Technology(in Chin. ) , 2010, 39（11）: 40-43.

[5] GARAT M, lASLAZ G. Improved aluminum alloys for common rail diesel cylinder heads[J]. AFS, 2007, 2(2): 1-8.

[6] EIGENFELD K, FRANKE A. New developments in heat resistant aluminum casting materials[J]. Casting Materials, 2004(4): 4-9.

[7] Chen Yajun, Xu Qingyan, Huang Tianyou. Development of Research on Grain Refiners for Aluminum Alloys[J]．Materials Review(in Chin. ), 2006（12）：57-61.

[8] Haimin Ding, Xiangfa Liu. Influence of Si on stability of TiC in Al melts[J]. Trans. Nonferrous Met. Soc. China, 2011, 21(7): 1465-1472.

DOI: 10.1016/s1003-6326(11)60882-0

[9] Gao Zesheng. The supply industry of grain refiner in aluminum of the world(one)[J]. Light Metal(in Chin. ), 1999(9): 50-53.

[10] Zhong Yi, Su Yunsheng, Lin Dachao. The morphological control of the modified by grain refining of Aluminium and aluminium alloy[J]．Journal of Kunming University of Science and Technology(in Chin. ), 1999(3): 23-27.

[11] MURTY B S, KORI SA, CHAKRABORTYM. Grain refinement of aluminum and its alloys by heterogeneous nucleation and alloying[J]. International Materials Reviews, 2002, 47: 3-29.

DOI: 10.1179/095066001225001049

[12] Shu Huaji, Si Naichao, Sun Shaochun , etc. Effects of AlTi5B1 on Structure and Properties of Hypoeutectic Al-Si Alloy[J]. Foundry(in Chin. ), 2011 (11) : 1122-1125.

[13] Gao Song, Shu Da, Wang Lei, etc. Research progress of Al-Ti-B grain refiner[J]. LAFT(in Chin. ), 2007, 35(2) : 7-10.

[14] Sun Y J, Wang Q L, Li C C, and Geng H R, J Univ Jinan 26 (2012) 115 [In Chinese].

[15] Kobayashi T, Mater Sci Eng A 280 (2000) 8.

[16] Fan Yingguang, Zhang Xiuhai, Tang Hongqun, etc. Influence of RE on Mechanical Properties of Optimized Al-Si Casting Alloy[J]. Hot Working Technology(in Chin. ), 2012, 41(5) : 49-51.