Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 32, No. 1 (January 2019) 92-98    Article in Press

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  EFFECTS OF VARIOUS AGEING HEAT TREATMENTS ON MICROSTRUCTURAL FEATURES AND HARDNESS OF PISTON ALUMINUM ALLOY
 
M. Azadi, S. Rezanezhad, M. Zolfaghari and M. Azadi
 
( Received: November 03, 2018 – Accepted in Revised Form: January 03, 2019 )
 
 

Abstract    Piston aluminum alloys have different intermetallic phases, such as Cu3Al, Mg2Si ,and AlNi phases. The morphology and the distribution of such phases have important roles on mechanical properties of the piston material. Therefore, in this research, various ageing heat treatments on the mentioned material were done and the microstructural feature and the hardness were studied. Obtained results showed that solutioning at 515 °C for 7 hours and ageing at 205 °C for 7 hours, was the superior heat treatment process, since such treatment led to increase the hardness value to its highest value (153 BHN) for the piston aluminum alloy. This heat treatment caused to increase the size of Si particles obviously and caused to precipitate other intermetallic phases of Al (Ni,Cu) and Ni-Si. Additionally, solutioning at 500 °C for 5 hours and ageing at 180 °C for 9 hours resulted in coarsening Si and Al-Ni participates in the longitudinal direction, which was caused to increase the hardness value to 137 BHN. Energy dispersive X-ray spectroscopy (EDS) results indicated that when the specimen aged at 230 °C for 5 hours, other intermetallic phases such as Al (Ni,Si) and Mg2Si appeared in the matrix.

 

Keywords    Aluminum Alloy, Piston, Heat Treatment, Microstructure, Hardness

 

چکیده   

آلیاژهای آلومینیومی پیستون دارای فازهای بین فلزی مختلفی همانند Cu3Al، Mg2Si و AlNi هستند. مرفولوژی و توزیع چنین فازهایی دارای نقش مهمی بر خواص مکانیکی چنین موادی دارند. بنابراین در این تحقیق، عملیات های حرارتی رسوب سختی مختلف بر ماده موردنظر انجام شد و جنبه های ریزساختاری و سختی مورد مطالعه قرار گرفت.نتایج حاصل نشان داد که عملیات انحلال در دمای 515 درجه سانتی گراد به مدت 7 ساعت و رسوب سختی در دمای 205 درجه سانتی گراد به مدت 7 ساعت بهترین عملیات حرارتی محسوب می¬شود، زیرا که چنین عملیاتی منجر به افزایش سختی به بیشترین مقدار (153 BHN) برای آلیاژ آلومینیومی پیستون شد.این عملیات حرارتی موجب شد تا اندازه ذرات سیلیسیم به صورت مشخص افزایش یابد و فازهای بین فلزی Al (Ni,Cu) و Ni-Si رسوب پیدا کند. همچنین، انحلال در دمای 500 درجه سانتی گراد به مدت 5 ساعت و رسوب سختی در دمای 180 درجه سانتی گراد به مدت 9 ساعت سبب افزایش رسوبات سیلیسیم و Al-Ni در جهت طولی شد که این امر موجب افزایش مقدار سختی تا 137 BHN گردید. نتایج طیف سنجی متفرق انرژی (EDS) نشان داد زمانی که نمونه در دمای 230 درجه سانتی گراد به مدت 5 ساعت پیرسخت شد، دیگر فازهای بین فلزی مانند Al (Ni,Si) و Mg2Si در زمینه پدیدار شدند.

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