Mechanical zog
Brass has different mechanical properties due to different zinc content. Fig. 7 is a graph showing the change of mechanical properties of brass with different zinc content. For brass, σb and δ increase with the increase of zinc content. For ( plus ) brass, the strength at room temperature increases continuously before the zinc content increases to about 45 percent . If the zinc content is further increased, the R phase with greater brittleness (solid solution based on Cu5Zn8 compound) appears in the alloy structure, and the strength decreases sharply. The room temperature plasticity of ( plus ) brass always decreases with the increase of zinc content. Therefore, the copper-zinc alloy containing more than 45 percent zinc has no practical value.
Ordinary tooj dag yog dav siv, xws li dej tank siv, dej thiab cov kav dej, khoom plig, corrugated yeeb nkab, serpentine yeeb nkab, condenser yeeb nkab, plhaub casing, ntau yam complex punched khoom, kho vajtse thiab hais txog. Nrog rau qhov nce ntawm zinc cov ntsiab lus los ntawm H63 mus rau H59, lawv tuaj yeem tiv taus kev ua haujlwm kub, thiab feem ntau yog siv rau ntau qhov chaw ntawm cov tshuab thiab cov khoom siv hluav taws xob, stamping qhov chaw thiab cov twj paj nruag.
Txhawm rau txhim kho corrosion kuj, lub zog, hardness thiab machinability ntawm tooj dag, ib qho me me ntawm cov ntsiab lus xws li tin, aluminium, manganese, hlau, silicon, npib tsib xee, txhuas, thiab lwm yam (feem ntau 1 feem pua 2 feem pua, ob peb txog li. 3 feem pua 4 feem pua , thiab ob peb txog li 5 feem pua ) ntxiv rau tooj liab-zinc alloy los ua ternary, quaternary los yog quinary alloys, uas yog complex.
Zinc sib npaug coefficient
The microstructure of complex brass can be calculated according to the "zinc equivalent coefficient" of elements added in brass. Because a small amount of other alloying elements are added to Cu-Zn alloy, the /( plus ) phase region in Cu-Zn state diagram usually moves to the left or right. Therefore, the microstructure of special brass is usually equivalent to that of ordinary brass with increased or decreased zinc content. For example, the microstructure of Cu-Zn alloy with 1 percent silicon is equivalent to the alloy structure with 10 percent zinc added in Cu-Zn alloy. So the "zinc equivalent" of silicon is 10. The "zinc equivalent coefficient" of silicon is the largest, which makes the /( plus ) phase boundary in Cu-Zn system significantly move to the copper side, that is, the phase region is strongly reduced. The "zinc equivalent coefficient" of nickel is negative, that is, the phase region is enlarged.
Lub -theem thiab -theem nyob rau hauv tshwj xeeb tooj dag yog complex multi- ntsiab lus daws teeb meem, uas muaj zog ntxiv zog, thaum lub sij hawm -theem thiab -theem nyob rau hauv cov tooj dag yog yooj yim Cu-Zn cov ntsiab lus, uas muaj tsawg zog. Txawm hais tias zinc sib npaug yog sib npaug, cov khoom ntawm cov khoom siv sib xyaw ua ke thiab cov khoom siv yooj yim binary sib txawv. Yog li ntawd, ib qho me me ntawm ntau - cov ntsiab lus ntxiv dag zog yog ib txoj hauv kev los txhim kho cov khoom alloy.
