Mg-6Gd-2Zn-0.4Zr镁合金的组织与摩擦磨损性能
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摘要
用扫描电镜、硬度计及摩擦磨损试验机研究了不同状态Mg-6Gd-2Zn-0.4Zr(GZ62K)镁合金的显微组织、硬度和摩擦磨损性能。结果表明:铸态镁合金晶界处有白亮色β-(Mg,Zn)_3Gd相,晶界周围有片层状LPSO结构;T4和T6处理后,β相减少,LPSO结构消失;挤压加工后,镁合金晶粒细化,晶粒内部重新形成了LPSO结构。4种状态的镁合金硬度差别不大。不同状态镁合金的磨损机制都有磨粒磨损,铸态和T4态合金中存在粘着磨损;挤压加工后存在氧化磨损,其中挤压态镁合金耐磨性最好。LPSO结构、位错和晶界的相互交割以及β相对晶界的钉扎有利于提高镁合金的耐磨性能。
Microstructure,hardness,friction and wear resistance of Mg-6Gd-2Zn-0.4Zr(GZ62K)alloy were studied by using scanning electron microscope,hardness tester and friction and wear tester.The results show that the brightβ-(Mg,Zn)_3Gd phase distributes at the grain boundary and the lamellar LPSO structure locates around the grain boundary in the as-cast magnesium alloy.Theβphase reduces and the LPSO structure disappears after T4 and T6 treatment.After extrusion processing,the grain of magnesium alloy refines and the LPSO structure reforms in grains.The microhardness of the four magnesium alloys is similar.Different treatment of the alloys all show abrasive wear mechanism.The as-cast and T4 treatment alloys also show adhesive wear mechanism,but it becomes oxidation wear after extrusion processing.The wear resistance of alloy after extrusion processing is the best.In general,the pinning effect ofβphase and the intersection of LPSO structure,dislocation and grain boundary are beneficial to improving the wear resistance of magnesium alloy.
Microstructure,hardness,friction and wear resistance of Mg-6Gd-2Zn-0.4Zr(GZ62K)alloy were studied by using scanning electron microscope,hardness tester and friction and wear tester.The results show that the brightβ-(Mg,Zn)_3Gd phase distributes at the grain boundary and the lamellar LPSO structure locates around the grain boundary in the as-cast magnesium alloy.Theβphase reduces and the LPSO structure disappears after T4 and T6 treatment.After extrusion processing,the grain of magnesium alloy refines and the LPSO structure reforms in grains.The microhardness of the four magnesium alloys is similar.Different treatment of the alloys all show abrasive wear mechanism.The as-cast and T4 treatment alloys also show adhesive wear mechanism,but it becomes oxidation wear after extrusion processing.The wear resistance of alloy after extrusion processing is the best.In general,the pinning effect ofβphase and the intersection of LPSO structure,dislocation and grain boundary are beneficial to improving the wear resistance of magnesium alloy.
引文
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[15]Cao L J,Wang Q D,Wu Y J,et al.Friction and wear behavior of Mg-11Y-5Gd-2Zn-0.5Zr(wt%)alloy with oil lubricant[J].Rare Metals,2013,32(5):453-458.
[2]杨绍斌,杨东旭,董伟,等.AZ31镁合金/6061铝合金电焊接头的组织及力学性能[J].金属热处理,2016,41(11):29-33.Yang S B,Yang D X,Dong W,et al.Microstructure and mechanical properties of spot welding joint of AZ31 magnesium alloy[J].Heat Treatment of Metals,2016,41(11):29-33.
[3]杨树杰,张洁,刘清华,等.热处理对GZ60K镁合金摩擦磨损性能的影响[J].材料热处理学报,2017,38(5):49-53.Yang S J,Zhang S J,Liu Q H,et al.Effect of heat treatment on friction and wear properties of GZ60K magnesium alloy[J].Transactions of Materials and Heat Treatment,2017,38(5):49-53.
[4]段翠芳,常万军.ZK60镁合金ACPP挤压棒材组织演变及其时效析出强化[J].金属热处理,2014,39(8):49-52.Duan C F,Chang W J.Microstructure evolution of extrusion ZK60magnesium alloy bar by ACPP and its precipitation strengthening[J].Heat Treatment of Metals,2014,39(8):49-52.
[5]黄伟九,林强,郭源君,等.热处理对AS41镁合金显微组织及摩擦学性能的影响[J].材料热处理学报,2010,31(9):89-93.Huang W J,Lin Q,Guo Y J,et al.Effects of heat treatment on microstructure and tribological properties of AS41 magnesium alloy[J].Transactions of Materials and Heat Treatment,2010,31(9):89-93.
[6]纪嘉明,鲁远勇,吴晶,等.稀土铈对铝青铜组织及耐磨性的强化作用[J].特种铸造及有色合金,2013,33(7):672-675.Ji J M,Lu Y Y,Wu J,et al.Microstructure and wear resistance of new aluminum bronze with Ce[J].Special Casting and Nonferrous Alloys,2013,33(7):672-675.
[7]Zhang X B,Ba Z X,Wang Z Z,et al.Microstructures and corrosion behavior of biodegradable Mg-6Gd-x Zn-0.4Zr alloys with and without long period stacking ordered structure[J].Corrosion Science,2016,105:68-77.
[8]Taltavull C,Rodrigo P,Torres B,et al.Dry sliding wear behavior of AM50B magnesium alloy[J].Materials and Design,2014,56:549-556.
[9]卢春辉,袁柯,尹健,等.高温固溶处理对Mg-15Gd-2Zn-0.6Zr合金组织结构及力学性能的影响[J].稀有金属与硬质合金,2016,44(5):55-59.Lu C H,Yuan K,Yin J,et al.Effect of high temperature solid solution treatment on microstructure and mechanical properties of Mg-15Gd-2Zn-0.6Zr alloy[J].Rare Metals and Cemented Carbides,2016,44(5):55-59.
[10]沈崇,章晓波,薛亚军,等.热处理对含LPSO结构Mg-Y-Cu-Zr镁合金组织与腐蚀行为的影响[J].材料热处理学报,2015,36(9):137-142.Shen C,Zhang X B,Xue Y J,et al.Effect of heat temperature on microstructure and corrosion behavior of Mg-Y-Cu-Zr magnesium alloy with LPSO structure[J].Transactions of Materials and Heat Treatment,2015,36(9):137-142.
[11]Du Y X,Wu Y J,Peng L M,et al.Formation of lamellar phase with18R-type LPSO structure in an as-cast Mg96Gd3Zn1(at%)alloy[J].Materials Letters,2016,169:168-171.
[12]Cao L J,Wu Y J,Peng L M,et al.Microstructure and tribological behavior of Mg-Gd-Zn-Zr alloy with LPSO structure[J].Transactions of Nonferrous Metals Society of China,2014,24(12):3785-3791.
[13]Zhang J,Zhang X B,Liu Q H,et al.Effects of load on dry sliding wear behavior of Mg-Gd-Zn-Zr alloys[J].Journal of Materials Science and Technology,2017,33:645-651.
[14]周芸,孙勇,周兆,等.添加铜对ZA12合金摩擦磨损性能的影响[J].稀有金属,1999,23(2):150-152.Zhou Y,Sun Y,Zhou Z,et al.Influence of adding Cu on friction and wear properties of ZA12 alloy[J].Chinese Journal of Rare Metals,1999,23(2):150-152.
[15]Cao L J,Wang Q D,Wu Y J,et al.Friction and wear behavior of Mg-11Y-5Gd-2Zn-0.5Zr(wt%)alloy with oil lubricant[J].Rare Metals,2013,32(5):453-458.