Effects Of Ni Element On Microstructure And Properties Of ZA35Alloy

In the present society, ZA alloy is widely used as a new structural engineeringmaterial, and become the preferred alternative materials instead of aluminum, copper andiron-carbon alloy, it is widely used in various industrial fields. Although ZA alloys havegood strength and hardness, low production cost, simple process, easy to operate. However,ZA alloy has low plasticity, poor toughness, corrosion, etc. The disadvantage is alsogreatly susceptible to restrict its field of application. In this thesis, the effects of addingvolume of elements Ni and heat treatment to ZA35alloy were studied; corrosion resistanceof different amounts of Ni, and corrosion law were expanded research and analysis byelectrochemical workstation; the microstructure and mechanical properties of ZA35alloywere studied by universal electronic tensile machine testing, XRD diffraction analysis,optical and scanning electron microscopy and other methods.The results showed that when added0.5%elements Ni, microstructure of ZA35alloytransformed from original coarse dendrites organization into small groups flocculent tissuemorphology, alloy microstructure morphology has been significantly refined, the hardnessof alloy achieved171HB by heat treatment（365℃×1.5h+150℃×3h）.Ni element added to the alloy ZA35mainly exists in two forms, part of element Nibecome solid solution in α-Al matrix, and another part of element Ni will form Ni3Alintermetallic compounds in the matrix. ZA35alloy can be refined by these compounds toimprove the mechanical properties, ZA35-0.5%Ni alloy also has a higher corrosionresistance after solution treatment, and this is due to the decrease in precipitation phasecaused by the reduction of the pitting incidence. Since the temperature is a major factoraffecting anode corrosion, so reducing the temperature can effectively prevent thecorrosion of ZA35-0.5%Ni alloy.