Structure,Mechanical Property And Wear Behaviors Of Zrti-based Alloy

Zirconium（Zr）and titanium（Ti）belong to the same group（IVB）in the periodic table of elements,and have similar physic-chemical properties with Ti.Those two elements can form infinite solid solutions of hexagonal close packed structure structural a phase in room temperature.ZrTi alloys have better comprehensive properties than pure Ti and pure Zr,such as biological properties,corrosion properties,friction and wear properties and mechanical properties.ZrTi alloys have been potential value in biomedicine,chemical engineering,aviation and other fields.There is still much room for exploration in the composition and organization of Zr-Ti alloys.In addition,among the many failure modes of alloys,the loss due to wear failure reaches more than half.The evaluation of metallic material friction and wear properties represents an important stage in the process of developing new materials.It is important to study the Zr alloys with comprehensive mechanical properties and the friction and wear properties for the development of aviation and aerospace materials.Above of all,in this paper,add nickel to Zr-Ti matrix alloy,which can improve the matrix alloy mechanical properties.The friction and wear properties of the as-forged ZrTiAlV alloy and the corresponding wear mechanism were also studied.In this paper,ZrTiNi alloys are prepared by vacuum non-consumable,and their phases,microstructure and mechanical properties were studied.With the addition of Ni,the phase composition of alloys changes fromαphase toαphase+hcp C14 Laves-phase.The thickness of lamellarαphase decreases with increasing Ni content.The Zr-Ti-3wt.%Ni alloys exhibits better ultimate compressive strength and compressive plasticity（1715 MPa and 9.70%）.The friction and wear behaviors of as-forged Zr_χTi_0.9-χAlV（χ=0,20,47,51 wt.%）were studied by considering the effect of content of Zr and applied load in this paper.The results show that the friction of coefficient（COF）decrease with the load increase.The20Z has a lower COF and an excellent anti-wear when the load of 1N and 2N.The predominant wear mechanism is mild abrasive wear and mild adhesive coexist.With the increase of load,51Z has a lower COF under the load of 5N and 10N,and better anti-wear（5N and 10N）.The main wear mechanism is mild abrasive wear.