粉末冶金Ti-22Al-25Nb合金的真空热压烧结工艺
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摘要
以气雾化法获得的Ti-22Al-25Nb(at.%)预合金粉末为初始原料,采用真空热压烧结工艺方法制备组织致密、成分均匀的粉末冶金Ti-22Al-25Nb合金。应用有限元软件MSC.Marc对Ti-22Al-25Nb(at.%)预合金粉末的致密化过程进行数值模拟,分析了温度和压力对Ti-22Al-25Nb粉末致密化过程的影响,揭示了粉末相对密度随温度和压力变化的规律,得到优化的烧结工艺参数,以指导热压实验烧结。通过热压烧结实验制备了组织致密、成分均匀的Ti-22Al-25Nb合金,发现1 050℃/35 MPa/1 h条件下烧结的合金具有最优的室温和650℃高温综合力学性能。
A powder metallurgy(P/M) Ti-22 Al-25 Nb alloy with dense microstructure and uniform composition was prepared by using vacuum hot-pressing sintering method. The original powders were determined to be Ti-22 Al-25 Nb(at.%)pre-alloyed powders which obtained by aerosol method. The densification process of the Ti-22 Al-25 Nb(at.%)pre-alloyed powders was simulated numerically by using the finite element software MSC. Marc. The effects of temperature and pressure on the densification processes of the Ti-22 Al-25 Nb powders were analyzed. The evolution of relative densities varying with temperature and pressure was revealed herein. In addition,the optimized sintering parameters were obtained to guild the following hot-pressing sintering experiments. The dense P/M Ti-22 Al-25 Nb alloy with uniform composition was fabricated by hot-pressing sintering experiments. It may be observed that the alloy which is sintered at 1 050 ℃/35 MPa/1 h demonstrates the optimal mechanics properties at room temperature and 650 ℃,respectively.
A powder metallurgy(P/M) Ti-22 Al-25 Nb alloy with dense microstructure and uniform composition was prepared by using vacuum hot-pressing sintering method. The original powders were determined to be Ti-22 Al-25 Nb(at.%)pre-alloyed powders which obtained by aerosol method. The densification process of the Ti-22 Al-25 Nb(at.%)pre-alloyed powders was simulated numerically by using the finite element software MSC. Marc. The effects of temperature and pressure on the densification processes of the Ti-22 Al-25 Nb powders were analyzed. The evolution of relative densities varying with temperature and pressure was revealed herein. In addition,the optimized sintering parameters were obtained to guild the following hot-pressing sintering experiments. The dense P/M Ti-22 Al-25 Nb alloy with uniform composition was fabricated by hot-pressing sintering experiments. It may be observed that the alloy which is sintered at 1 050 ℃/35 MPa/1 h demonstrates the optimal mechanics properties at room temperature and 650 ℃,respectively.
引文
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[17]王海涛,陈宏超,王鹏,等.放电等离子烧结制备高强度奥氏体不锈钢[J].燕山大学学报,2013,37(1):34-38.WANG Haitao,CHEN Hongchao,WANG Peng,et al.Preparation of High Strength Austenitic Stainless Steel by Spark Plasma Sintering[J].Journal of Yanshan University,2013,37(1):34-38.
[18]陈灿坤,刘少存,张洋,等.放电等离子烧结制备碳化钛块材研究[J].燕山大学学报,2012,36(4):320-323.CHEN Cankun,LIU Shaocun,ZHANG Yang,et al.Study on Preparation of Titanium Carbide Block by Spark Plasma Sintering[J].Journal of Yanshan University,2012,36(4):320-323.
[19]KANG S J L.Sintering:Densification,Grain Growth,and Microstructure[M].Amsterdam:Elsevier Butterworth-Heinemann,2005.
[20]BOEHLERT C J,MAJUMDAR B S,SEETHARA-MAN V,et al.The Microstructural Evolution in Ti-Al-Nb O+Bcc Orthorhombic Alloys[J].Metallurgical and Materials Transactions A,1999,30(9):2305-2323.(编辑陈勇)
[2]SUBRAMANIAN P R,MENDIRATTA M G,DIMIDUKD M.The Development of Nb-based Advanced Intermetallic Alloys for Structural Applications[J].Journal of Metallurgy,1996,48(1):33-38.
[3]曾汉民.高技术新材料要览[M].北京:中国科学技术出版社,1993:119.ZENG Hanmin.High-tech New Materials[M].Beijing:China Science and Technology Press,1993:119.
[4]陈国栋.高温合金[M].北京:冶金工业出版社,1988:38.CHEN Guodong.High Temperature Alloys[M].Beijing:Metallurgical Industry Press,1988:38.
[5]张建伟,李世琼,梁晓波,等.Ti3Al和Ti2Al Nb基合金的研究与应用[J].中国有色金属学报,2010,20(b10):336-341.ZHANG Jianwei,LI Shiqiong,LIANG Xiaobo,et al.Studies and Applications of Ti3Al and Ti2Al Nb-based Alloys[J].Chinese Journal of Nonferrous Metals,2010,20(b10):336-341.
[6]KUHRT C,SCHROPF H,SCHULTZ L,et al.Mechanical Alloying for Strucutral Applications[C]//Materials Park.OH:ASM International,1993:189-195.
[7]WANG G X,DAHMS M.Ti Al-based Alloys Prepared by Elemental Powder Metallurgy[J].International Journal of Powder Metallurgy,1992,24(4):219-225.
[8]梁宝岩,王明智.反应烧结制备Ti2Al N-Ti N复合材料[J].燕山大学学报,2010,34(3):204-206.LIANG Baoyan,WANG Mingzhi.Preparation of Ti2Al N-Ti N Composites by Reactive Sintering[J].Journal of Yanshan University,2010,34(3):204-206.
[9]赵玉成,张文娜,宋文灿,等.Si_3N_4的结构状态对放电等离子烧结制备Sialon陶瓷的影响[J].燕山大学学报,2012,36(3):230-234.ZHAO Yucheng,ZHANG Wenna,SONG Wencan,et al.Effects of Structural State of Si_3N_4 on Sialon Ceramics Prepared by Spark Plasma Sintering[J].Journal of Yanshan University,2012,36(3):230-234.
[10]WANG Y H,LIN J P,YUE-HUI H E,et al.Reaction Mechanism in High Nb Containing Ti Al Alloy by Elemental Powder Metallurgy[J].Transactions of Nonferrous Metals Society of China,2006,6(4):853-857.
[11]贾建刚,马勤,吕晋军,等.机械活化/热压Fe3Si有序金属间化合物的制备[J].兰州理工大学学报,2007,33(1):14-16.JIA Jiangang,MA Qin,LYU Jinjun,et al.Preparation of Ordered Activation of Fe3Si Ordered Intermetallics by Mechanical Activation/Hot Pressing[J].Journal of Lanzhou University of Technology,2007,33(1):14-16.
[12]WANG G,YANG J,JIAO X.Microstructure and Mechanical Properties of Ti-22Al-25Nb Alloy Fabricated by Elemental Powder Metallurgy[J].Materials Science&Engineering A,2016,654:69-76.
[13]WANG Y X,ZHANG K F,LI B Y.Microstructure and High Temperature Tensile Properties of Ti22Al25Nb Alloy Prepared by Reactive Sintering with Element Powders[J].Materials Science&Engineering A,2014,608(25):229-233.
[14]SMITH P R,ROSENBERGER A H,SHEPARD MJ,et al.Review A P/M Approach for the Fabrication of an Orthorhombic Titanium Aluminide for MMC Applications[J].Journal of Materials Science,2000,35(13):3169-3179.
[15]YOLTON C F,BECKMAN J P.Powder Metallurgy Processing and Properties of the Ordered Orthorhombic Alloy Ti-22at.%Al-23at.%Nb[J].Materials Science&Engineering A,1995,192/193(Part 2):597-603.
[16]黄培云.粉末冶金原理[M].北京:冶金工业出版社,1982:334-340.HUANG Peiyun.The Principle of Powder Metallurgy[M].Beijing:Metallurgical Industry Press,1982:334-340.
[17]王海涛,陈宏超,王鹏,等.放电等离子烧结制备高强度奥氏体不锈钢[J].燕山大学学报,2013,37(1):34-38.WANG Haitao,CHEN Hongchao,WANG Peng,et al.Preparation of High Strength Austenitic Stainless Steel by Spark Plasma Sintering[J].Journal of Yanshan University,2013,37(1):34-38.
[18]陈灿坤,刘少存,张洋,等.放电等离子烧结制备碳化钛块材研究[J].燕山大学学报,2012,36(4):320-323.CHEN Cankun,LIU Shaocun,ZHANG Yang,et al.Study on Preparation of Titanium Carbide Block by Spark Plasma Sintering[J].Journal of Yanshan University,2012,36(4):320-323.
[19]KANG S J L.Sintering:Densification,Grain Growth,and Microstructure[M].Amsterdam:Elsevier Butterworth-Heinemann,2005.
[20]BOEHLERT C J,MAJUMDAR B S,SEETHARA-MAN V,et al.The Microstructural Evolution in Ti-Al-Nb O+Bcc Orthorhombic Alloys[J].Metallurgical and Materials Transactions A,1999,30(9):2305-2323.(编辑陈勇)