TY - JOUR N2 - The paper presents research on the effects of soft annealing parameters on a change of the impact strength KC and Brinell hardness (HB) of the EN AC-AlSi11 alloy. The research has been performed according to the trivalent testing plan for two input parameters – temperature in the range between 280°C and 370°C and time in the range between 2 and 8 hours. The application of such heat treatment improves the plasticity of the investigated alloy. The improvement of the impact strength KC by 71% and the decrease of the hardness HB by 20% was achieved for the soft annealing treatment conducted at a temperature 370°C for 8 hours, compared to the alloy without the heat treatment. A change of the form of eutectic silicon precipitations which underwent refinement, coagulation and partial rounding, had a direct effect on the hardness HB and impact strength KC. The results obtained were used to prepare space plots enabling the temperature and time for soft annealing treatment to be selected with reference to the obtained impact strength KC and hardness HB of the alloy with the heat treatment. L1 - http://www.czasopisma.pan.pl/Content/102047/PDF/afe-2017-0090.pdf L2 - http://www.czasopisma.pan.pl/Content/102047 PY - 2017 IS - No 3 DO - 10.1515/afe-2017-0090 KW - Heat treatment KW - Aluminium alloys KW - Alpax alloy KW - Silumins KW - Soft annealing A1 - Jarco, A. PB - The Katowice Branch of the Polish Academy of Sciences VL - vol. 17 DA - 2017 T1 - Effect of Soft Annealing Treatment on Impact Strength and Hardness of the EN AC-AlSi11 Alloy UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/102047 T2 - Archives of Foundry Engineering ER -