کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
829140 1470336 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of heat treatment on the microstructure and mechanical properties of AA2618 DC cast alloy
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Effects of heat treatment on the microstructure and mechanical properties of AA2618 DC cast alloy
چکیده انگلیسی


• The microstructure and mechanical properties of AA2618 DC cast alloy were studied.
• The Al2CuMg, Al2Cu, Al7Cu4Ni, Al7Cu2(Fe,Ni) and Al9FeNi phases were identified.
• Solution treatment at 530 °C for 5 h is the optimum solution treatment.
• Different combinations of strength and ductility can be achieved.
• The strengthening of AA2618 DC cast alloy was caused by GPB zones and S′ phase.

Direct chill (DC) cast ingot plates of AA2618 alloy have been increasingly used for large-mold applications in the plastics and automotive industries. The effects of different heat treatments on the microstructure and mechanical properties of AA2618 DC cast alloy were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and hardness and tensile testing. The as-cast microstructure contained a considerable amount of coarse intermetallic phases, including Al2CuMg, Al2Cu, Al7Cu4Ni, Al7Cu2(Fe,Ni) and Al9FeNi, resulting in poor mechanical properties. Solution treatment at 530 °C for 5 h dissolved the first three phases into the solid solution and consequently improved the mechanical properties of the alloy. By utilizing the appropriate aging temperature and time, different combinations of strength and ductility could be obtained to fulfill the design requirements of large-mold applications. The strengthening of AA2618 DC cast alloy under the aging conditions studied was caused by GPB zones and S′ precipitates. The evolution of both precipitates in terms of their size and density was observed to have a significant effect on the mechanical properties of the alloy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials & Design - Volume 61, September 2014, Pages 133–140
نویسندگان
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