عنوان البحث(Papers / Research Title)
The Effect of Iron Addition on the Dry Sliding Wear
الناشر \ المحرر \ الكاتب (Author / Editor / Publisher)
زهير طالب خليف الطائي
Citation Information
زهير,طالب,خليف,الطائي ,The Effect of Iron Addition on the Dry Sliding Wear , Time 5/11/2011 10:25:06 AM : كلية هندسة المواد
وصف الابستركت (Abstract)
Corrosion Behavior of Cu Al Ni Shape Memory Alloy
الوصف الكامل (Full Abstract)
In this paper, dry sliding wear and corrosion behavior of Cu + 13wt% Al +3.8 wt% Ni was prepared by powder metallurgy. Dry sliding wear has been studied based on pin on disk at constant velocity and constant sliding distance.Corrosion behavior in 5 wt% NaOH solution based up on potentiostatic ( Tafel )has been presented for base shape memory alloy ( Cu + 13% Al + 3.8 % Ni ) intwo cases austenitic and martensitic phase state . Further more , the effect of Feadditions as ( 0.4 , 0.8 and 1.2 wt% ) on the sliding wear and corrosion behavior ofbase alloy has also been studied .It is clear that Cu Al Ni shape memory alloy inmartensitic state has more wear resistance than in austenitic structure . Also ,corrosion resistances are better than in martensitic structure because the alloy hascorrosion current density as 336.45 ?A/cm2 in martansitic where as the corrosioncurrent density is 633.62 ?A/cm2 in austenitic structure . Further more , when theiron content increases , wear and corrosion rate increase too .Keywords : Shape memory alloys, Powder metallurgy, Cu Al Ni, Dry sliding,Corrosion behavior.In this paper, dry sliding wear and corrosion behavior of Cu + 13wt% Al +3.8 wt% Ni was prepared by powder metallurgy. Dry sliding wear has beenstudied based on pin on disk at constant velocity and constant sliding distance.Corrosion behavior in 5 wt% NaOH solution based up on potentiostatic ( Tafel )has been presented for base shape memory alloy ( Cu + 13% Al + 3.8 % Ni ) intwo cases austenitic and martensitic phase state . Further more , the effect of Feadditions as ( 0.4 , 0.8 and 1.2 wt% ) on the sliding wear and corrosion behavior ofbase alloy has also been studied .It is clear that Cu Al Ni shape memory alloy inmartensitic state has more wear resistance than in austenitic structure . Also ,corrosion resistances are better than in martensitic structure because the alloy hascorrosion current density as 336.45 ?A/cm2 in martansitic where as the corrosioncurrent density is 633.62 ?A/cm2 in austenitic structure . Further more , when theiron content increases , wear and corrosion rate increase too .Keywords : Shape memory alloys, Powder metallurgy, Cu Al Ni, Dry sliding,Corrosion behavior.During the past years, smartmaterials and structures havereceived increasing attention becauseof their great scientific andtechnological significance(1)Shape memory alloys are the mostimportant branch from the smart and/or intelligence materials.The term "Shape memory alloys " refers to thatgroup of metallic materials have theability to return to some previouslydefined shape or size when subjectedto appropriate thermal cycle ( 2 ) .Both Ni –Ti and copper based shapememory alloys such as Cu Al Niand Cu Zn Al are presently availablefor commericial shape memoryapplications . Ni – Ti alloysgenerally have shape memoryproperties better than Cu based shapememory alloys but they areexpensive in finished form ( 3 ) . Inmany applications Cu based alloysprovide more economical alterrativeto Ni – Ti specially in thermal –mechanical actuation mechanisms ( 4 ). Although early copper based shapememory alloys suffered fromintergranular failure due to coarsegrain structure , the recentdevelopment of fine grain Cu –based alloys has improvedmechanical properties by twoconcept , the first is by addingalloying elements such as Ti ,Zr ,Band Co into Cu Al Zn or Cu Al Nialloys during the casting , whereasthe second procedure is by usingpowder metallurgy technique toproduce these alloys ( 5 ) . The mostof presented works by researchershad focused on the martensitictransformation mechanism in Cu AlNi or Cu Zn Al ( 4 ) andmechanical behavior of casting Cu –based alloys ( 6 ) . For porous Ni Tishape memory alloy corrosion rate ishigh due to large surface area andspecific surface morphology ( 7 ).Stress corrosion cracking in Ni Tialloys had been reported byKaren,2003( 8). Theisothermal oxidation behavior of NiTi alloy in pure oxygen over thetemperature range of 450-750 hadbeen studied by Xu etal ( 9 ) , 2004The effect of wear and services onthe corrosion resistance of Ni Ti andstainless steel stents with SEMinvestigation had been presented bytrepanier etal ( 10 ) , 2006.Moreira etal , presented corrosion behavior ofelectron beam melted Ni Ti alloy in3.56 wt% NaCl (11). Neg et al , 2008Studied corrosion and wearproperties of laser surface modifiedNiTi with Mo and ZrO2 additives (12).Kumar etal , 2009 studiednanoindentation properties of Ti N/Ni Ti thin films in electro chemicalsensing applications (13 ) . For Cu AlNi based shape memory alloys ,Abid Ali , 2007 presentedinvestigation of preparation andmechanical characterization as wellas martensitic transformationstudies(5) . Perhaps , there is no workfor sliding wear and corrosionbehavior for porous Cu Al Ni basedshape memory alloy . So that thispaper aims to investigate dry slidingwear and corrosion behavior bypotentiostatic studies taking in toconsideration the effect of Feadditives for both wear and corrosionrate .
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