Nb含量对Zr_(50)Ti_(50)合金显微组织及力学性能影响
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摘要
采用电弧熔炼炉制备了(ZrTi)_(100-x)Nb_x(x=0, 2, 4, 6, 10 at%)合金,通过光学显微镜(OM),X-射线衍射仪(XRD)和扫描电镜(SEM)等研究了合金的显微结构。结果表明:当Nb含量从0%增加到6%时,铸态合金的物相结构均为α′相;Nb含量为10%时,合金的物相结构由α′相转变为β相。铸态Zr_(50)Ti_(50)合金的组织由针状的α′相及原始β晶界组成,α′的长度及原始β晶粒尺寸最小。当Nb元素含量从2%增加到6%时,合金的原始β晶粒由等轴状变为板条状,且(ZrTi)_(96)Nb_4合金的原始β晶粒尺寸及α′的长度最大;继续增加Nb含量到10%时,合金组织为等轴的β晶粒。铸态Zr_(50)Ti_(50)合金的屈服强度和抗压强度最大,随着Nb含量的增加,合金的强度先降低后增加,在Nb含量为4%时,合金的强度最低。断口形貌表明Nb元素的加入使合金的断裂方式由脆性断裂向韧性断裂转变。
(ZrTi)_(100-x)Nb_x(x=0, 2, 4, 6, 10 at%) alloys were prepared by arc melting furnace under vacuum atmosphere,and microstructure of the alloys was studied by means of optical microscope(OM), X-ray diffractometer(XRD) and scanning electron microscopy(SEM). The results show that when the content of Nb increases from 0% to 6%, the phase structure of the as-cast alloys is α′-phase, and the phase structure of the as-cast alloys is changed from α′ phase to β phase when the content of Nb is 10%. The microstructure of the as-cast Zr50 Ti50 alloy consists of acicular α ′phase and prior β grain boundary, and the length of α′ phase and the size of prior β grain are the smallest. When the content of Nb is increased from 2% to 6%, the prior β grain of the alloys changes from equiaxed to lath shape, and the prior β grain size and α′ phase length of the(ZrTi) _(96)Nb_4 alloy are the largest, and when the content of Nb is increased to 10%, the microstructure of the alloy is equiaxed β grain. The yield strength and compressive strength of the as-cast Zr_(50)Ti_(50) alloy are the maximum. With the increase of Nb content, the strength of the as-cast(ZrTi)_(100-x)Nb_x alloys decreases first and then increases. When the Nb content is 4%, the strength of the alloy is the lowest. The fracture morphology shows that the fracture mode of the alloys changes from brittle fracture to ductile fracture with the addition of Nb element.
(ZrTi)_(100-x)Nb_x(x=0, 2, 4, 6, 10 at%) alloys were prepared by arc melting furnace under vacuum atmosphere,and microstructure of the alloys was studied by means of optical microscope(OM), X-ray diffractometer(XRD) and scanning electron microscopy(SEM). The results show that when the content of Nb increases from 0% to 6%, the phase structure of the as-cast alloys is α′-phase, and the phase structure of the as-cast alloys is changed from α′ phase to β phase when the content of Nb is 10%. The microstructure of the as-cast Zr50 Ti50 alloy consists of acicular α ′phase and prior β grain boundary, and the length of α′ phase and the size of prior β grain are the smallest. When the content of Nb is increased from 2% to 6%, the prior β grain of the alloys changes from equiaxed to lath shape, and the prior β grain size and α′ phase length of the(ZrTi) _(96)Nb_4 alloy are the largest, and when the content of Nb is increased to 10%, the microstructure of the alloy is equiaxed β grain. The yield strength and compressive strength of the as-cast Zr_(50)Ti_(50) alloy are the maximum. With the increase of Nb content, the strength of the as-cast(ZrTi)_(100-x)Nb_x alloys decreases first and then increases. When the Nb content is 4%, the strength of the alloy is the lowest. The fracture morphology shows that the fracture mode of the alloys changes from brittle fracture to ductile fracture with the addition of Nb element.
引文
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[4] 姚美意,段文荣,吴晓彤,等.热处理对锆合金在360 ℃LiOH水溶液中腐蚀吸氢行为的影响[J].材料热处理学报,2016,37(9):34-37.YAO Mei-yi,DUAN Wen-rong,WU Xiao-tong,et al.Effect of treatment on hydrogen absorption behavior of zirconium alloys during corrosion in lithiated water at 360 ℃[J].Transactions of Materials and Heat Treatment,2016,37(9):34-37.
[5] 炊鹏飞.Zr-Si合金的显微组织及力学性能[J].材料热处理学报,2018,39(4):20-24.CHUI Peng-fei.Microstructure and mechanical properties of Zr-Si alloys[J].Transactions of Materials and Heat Treatment,2008,39(4):20-24.
[6] Chui P F.Near β-type Zr-Nb-Ti biomedical alloys with high strength and low modulus[J].Vacuum,2017,143:54-58.
[7] Nie L,Zhan Y Z,Liu H,et al.Novel β-type Zr-Mo-Ti alloys for biological hard tissue replacements[J].Materials and Design,2014,53:8-12.
[8] Xia C Q,Jiang X J,Wang X Y,et al.Structure and mechanical properties of as-cast (ZrTi)100-xBx alloys[J].Journal of Alloys and Compounds,2015,637:90-97.
[9] Zhang M,Li Y N,Zhang F C,et al.Effect of annealing treatment on the microstructure and mechanical properties of a duplex Zr-2.5Nb alloy[J].Materials Science and Engineering A,2017,706:236-241.
[10] Chui P F.Effect of boron content on microstructure and mechanical properties of Ti50Zr50 alloys[J].Vacuum,2018,154:25-31.
[11] Nie L,Zhan Y Z,Hu T,et al.β-type Zr-Nb-Ti biomedical materials with high plasticity and low modulus for hard tissue replacements[J].Journal of the Mechanical behavior of Biomedical Materials,2014,29:1-6.
[12] Li C L,Zhan Y Z,Jiang W P.Zr-Si biomaterials with high strength and low elastic modulus[J] Materials and Design,2011,32:4598-4602.
[13] Suyalatu,Nomura N,Oya K,et al.Microstructure and magnetic susceptibility of as-cast Zr-Mo alloys[J].Acta Biomaterialia,2010,6:1033-1038.
[14] Kondo R,Nomura N,Suyalatu,et al.Microstructure and mechanical properties of as-cast Zr-Nb alloys[J].Acta Biomaterialia,2011,7:4278-4284.
[15] Terlinde G T,Duerig T W,Williams J C.Microstructure,tensile deformation,and fracture in aged Ti-10V-2Fe-3Al[J].Metallurgical Transactions A,1983,14:2101-2115.