Chemical composition influence on mechanical properties of Cu-Al-Si-Sn-Mn system bronze during its solidification in die mold

Chemical composition influence on mechanical properties of Cu-Al-Si-Sn-Mn system bronze during its solidification in die experimental studies results are presented. It has been established that for cast products from the studied bronze, which has been poured into die mold, manufacturing it is necessary to use an alloy in which, wt. %: Al=6.0…7.5; Si=1.0…2.5; Mn=0.21…0.45; Sn=1.0…2.2; inevitable impurities (nn) not more than 0.45; Cu is remainder at the components ratio, which is determined by dimensionless criterion KR, calculated by formula: KR = (1- 0,01•nn)•(Al-Si-Mn)/(1+Sn)2 and which is equal 0.32…0.85. Aluminum bronze with KR = 0.32…0.56 value in cast state (without heat treatment) is multi-phase alloy with following mechanical properties levels: В=423…550 MPa; 0,2 =279…397MPa; 5 =3,2…5,5%; KCU =13…21 J/cm2, which gives reason to classify it as high-strength aluminum bronze with sufficient, as for foundry alloys, plasticity level. This work results using will allow predicting the mechanical properties level of Cu-Al-Si-Sn-Mn system cast aluminum bronze with KR =0.32…0.56 and adapting its properties levels by chemical composition appropriate correction for cast parts manufacturing, taking into ac-count characteristics and their operation conditions in machine tool, instrument, mechanical, shipbuilding and other industries.