稀土元素Gd對NiAl-Cr(Mo)-Hf共晶合金的組織和壓

1、465Vol.46No.520105528532ACTA METALLURGICA SINICA May.2010pp.528532 GdNiAlCr(MoHf(,510080(,110016GdNi33Al28Cr5.9Mo0.1Hf (,%,(SEM(EPMA(TEM,Gleeble 1500.,GdNiAlCr(Mo,Heusler.Gd,NiAl/Cr(Mo,1373K.Gd0.1(,%,Cr(Mo,.NiAl,Gd,TG113A04121961(201005052805EFFECTS OF RARE EARTH ELEMENT Gd ON THEMICROSTRUCTURE AND

2、MECHANICAL PROPERTIES OF NiAlCr(MoHf EUTECTIC ALLOYLIANG YongchunElectric Power Research Institute of Guangdong Power Grid Corporation,Guangzhou 510080GUO Jianting,SHENG Liyuan,ZHOU LanzhangInstitute of Metal Research,Chinese Academy of Sciences,Shenyang 110016Correspondent:GUO Jianting,professor,Te

3、l:(02423971917,E-mail:jtguoManuscript received 20091110,in revised form 20100124ABSTRACT The eects of rare earth element Gd on the microstructure and compressive properties of Ni33Al28Cr5.9Mo0.1Hf (atomic fraction,%eutectic alloy at room temperature and 1373K were studied.Very little amount of Gd di

4、ssolved in the NiAl and Cr(Mophases,and much more amount of Gd distributed in Heusler phase.Addition of Gd induced the microstructural renement,including the decrease of the eutectic cell size and the lamellae spacing between the NiAl and Cr(Moplates.The proper Gd addition leads to the improvement o

5、f the compressive yield strength and ductility of the alloy at room temperature,but Gd has a little eect on the compressive properties at 1373K.However,the Cr(Mophase was coarsened and distributed irregularly when 0.1Gd (mass fraction,%was added into the alloy,which resulted in the decrease of compr

6、essive properties at the testing temperature.KEY WORDS NiAl base alloy,rare earth Gd,intermetallics,microstructure,mechanical propertyNiAl(1911K(5.9g/cm 3,.NiAl*:20091110,:20100124:,1978,DOI:10.3724/SP.J.1037.2009.00747,1.24,NiAlCr(Mo,(Ren´e 80.Guo5,6,HfNiAlCr(Mo.5:Gd NiAlCr(MoHf529.NiAl Y, Nd,

7、Ce Dy7.Gd81112,1316,Gd TiAl.NiAlCr(MoHfGd,.1Ni,Al,Cr,Mo,Hf Gd(99.9% ,Ar,Cu Gd.Ni33Al28Cr5.9Mo0.1Hf(,%x Gd, x=0,0.01,0.05,0.1(,%,No.1, No.2,No.3,No.%,.(EDSS3400N(SEM(EPMA,EPMA1610(TEM,JEOL2010.SICA.4mm×4mm×6mm ,800.Gleeble1500.1373K,2×103s1.,±2K,20s.,1373K25%(.,.SEM .22.11G

8、d Ni33Al28Cr5.9Mo0.1Hfx Gd SEM.,Gd;NiAl,Cr(Mo., NiAl/Cr(Mo.1 EPMA TEM(2,Heusler,5.Cr(Mo.Cr(MoCr(Mo,Cr(Mo.1,No.2 No.3,Gd40µm30µm, 1Ni33Al28Cr5.9Mo0.1Hfx Gd(SEMFig.1SEM photos of Ni33Al28Cr5.9Mo0.1Hf(atomic fraction,%x Gd(mass fraction,%(ax=0(No.1,larger cell size and regular cell boundaries

9、(bx=0.01(No.2and(cx=0.05(No.3,eutectic cell rened and cell boundaries changed(dx=0.1(No.4,cell boundaries coarsened and the amount of Heusler phase increased53046Cr(Mo.Gd,;,.,7.3Gd NiAlCr(Mo,Cr(MoGd0.25µm Gd0.18µm.Gd0.1%,Gd(0.180nm,NiAl Cr(Mo,Gd/,1Ni33Al28Cr5.9Mo0.1Hfx Gd(EPMA Table1Chemic

10、al compositions of the phases in Ni33Al28Cr5.9Mo0.1Hfx Gd alloys(EPMA Alloy Phase Composition(atomic fraction,%Ni Al Cr Mo Hf Gd No.1NiAl47.6346.56 4.010.980.820 (x=0Cr(Mo8.079.5370.6211.7900 Heusler46.2225.83 4.48 2.1221.350 No.2NiAl48.2247.10 3.510.550.620.003 (x=0.01Cr(Mo7.1510.9468.4613.440.010.

11、001 Heusler45.6520.26 5.66 1.8917.299.250 No.3NiAl48.0247.31 4.0600.610.004 (x=0.05Cr(Mo 6.648.3472.7512.250.010.001 Heusler42.2422.76 4.13 1.9919.019.870 No.4NiAl48.1147.03 3.9700.880.002 (x=0.1Cr(Mo 6.5510.3871.3011.7600.001 Heusler44.0621.34 6.62 2.1417.45 8.3902Heusler TEMFig.2TEM brighteld imag

12、e(aand electron diraction pattern(bof Heusler phase in the alloy with x =0.13x=0x=0.05Fig.3SEM images of the alloys with x=0(aand x=0.05(b,showing the renement of lamellae due to Gd addition5:GdNiAlCr(MoHf531Cr(Mo;,Gd,Heusler.2.2Gd4.No.2No.311551170MPa,Gd.Gd,:(1GdNiAl/Cr(Mo,., 4GdFig.4Compressive pr

13、operties of the alloy with dierent Gdcontents,17,.(2GdNiAl (1,18.(3,OS,19.Gd,.4,No.2No.322%18%,2.NiAlCr(Mo,NiAl.20,NiAl/Cr(Mo;,NiAl ;No.2No.3.,.,21,Gd ,(Ni,Gd,22.5SEM. 5GdFig.5Fractographs of Ni33Al28Cr5.9Mo0.1Hfx Gd after compression at room temperature(ax =0(No.1,interface between NiAl and Cr(Mode

14、bonded(bx =0.01(No.2and (cx =0.05(No.3,extent of interface debonding reduced(dx =0.1(No.4,cell boundary weakened53246.NiAl Cr(Mo,. No.2No.3No.1(5ac,Gd NiAl/Cr(Mo.Gd(5d.4,No.2No.31373K340355MPa,No.1.,6Cr(Mo,.,No.1,Gd.Gd,Gd,.x=0.1 ,Cr(Mo,Heusler, .61373KFig.6SEM image of sidesection of the alloy with

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