Abstract Two Mo-TiC alloys with TiC mass fraction of 6% were prepared by powder metallurgy using ultrafine TiC powder with a particle size of 0.5 μm and a nanometer TiC powder with a particle size of 0.05 μm as raw materials. The effects of particle size and dispersion of TiC on the microstructures and tensile strength of Mo-TiC alloys were studied. The results show that, compared to the addition of ultrafine TiC powder, the addition of nanometer TiC powder has a significant improvement on the tensile strength of the alloy, but because the agglomeration of nano TiC powder in the matrix. When sintered at 1 950 ℃, the tensile strength of Mo-nano TiC alloy reaches 515 MPa, which is more than 30% higher than that of Moultrafine TiC alloy. After adding organic compound as a dispersant, the TiC aggregates in the Mo base are transformed from the spheroid to elongated shape, and some of the nanoscale TiC are fully dispersed the alloy grain is further refined and the strength of the alloy is improved. The tensile strength of the material sintered at 1 850 ℃ reaches 615 MPa.
CHEN Jiyong,FAN Jinlian,CHENG Huichao. Effects of particle size and dispersion of TiC on the microstructure and tensile strength of Mo alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(6): 614-618.
[1] 向铁根. 钼冶金[M]. 长沙: 中南大学出版社, 2009: 1-23. XIANG Tiegeng.Molybdenum Metallurgy[M]. Changsha: Central South University Press, 2009: 1-23. [2] 成会朝, 范景莲, 刘涛, 等. TZM钼合金制备技术及研究进展[J]. 中国钼业, 2008, 32(6): 40-45. CHENG Huichao, FAN Jinlian, LIU Tao, et al.Preparation technology and research progress of TZM molybdenum alloy[J]. China Molybdenum Industry, 2008, 32(6): 40-45. [3] 张久兴, 刘燕琴, 刘丹敏, 等. 微量La2O3对钼的韧化作用[J].中国有色金属学报, 2004, 14(1): 13-17. ZHANG Jiuxing, LIU Yanqin, LIU Danmin, et al.The toughening effect of trace La2O3 on molybdenum[J]. Chinese Journal of Nonferrous Metals, 2004, 14(1): 13-17. [4] 王东辉, 袁晓波, 李中奎, 等. 钼及钼合金研究与应用进展[J].中国材料进展, 2006, 25(12): 1-7. WANG Donghui, YUAN Xiaobo, LI Zhongkui, et al.Progress of research and application for Mo metal and its alloys[J]. Materials China, 2006, 25(12): 1-7. [5] 曹维成, 刘静, 任宜霞. 掺杂不同微量元素对钼材性能的影响[J]. 中国材料进展, 2006, 25(8): 29-32. CHAO Weicheng, LIU Jing, REN Yixia.Influence of different trace elements on the properties of molybdenum[J]. China Material Exhibition, 2006, 25(8): 29-32. [6] MROTZEK T, HOOFHNANN A, MARTIN U.Hardening mechanisms and recrystallization behaviour of several molybdenum alloys[J]. International Journal of Refractory Metals & Hard Materials, 2006, 24(4): 298-305. [7] KURISHITA H, KITSUNAI Y, HIRAOKA Y, et al.Development of molybdenum alloy with high toughness at low temperatures[J]. Metals Transactions, 1996, 37(1): 89-97. [8] 李大成,卜春阳, 赵宝华, 等. 掺杂镧钼丝组织和性能[J]. 中国钼业, 2006, 30(1): 39-41. LI Dacheng, BU Yangchun, ZHAO Baohua, et al.Doped lanthanum molybdenum wire and properties[J]. China Molybdenum Industry, 2006, 30(1): 39-41. [9] 杨晓青, 贺跃辉, 罗振中, 等. 掺杂La对钼组织和性能的影响[J]. 中国材料进展, 2006, 25(3): 30-33. YANG Xiaoqing, HEYuehui, LUO Zhenzhong, et al.Effects of doping La on microstructure and properties of molybdenum[J]. Materials in China, 2006, 25(3): 30-33. [10] 范景莲, 钱昭, 成会朝, 等. 微量TiC/ZrC对TZM合金室温及高温性能与组织的影响[J]. 稀有金属材料与工程, 2013, 42(4): 853-856. FAN Jinlian, QIAN Zhao, CHENG Huichao, et al.Effect of micro TiC/ZrC on the properties and microstructure of TZM alloy at room temperature and high temperature[J]. Rare Metal Materials and Engineering, 2013, 42(4): 853-856. [11] 卢明园, 范景莲, 成会朝, 等. TiC的添加对Mo-Ti合金性能与组织结构的影响[J]. 稀有金属材料与工程, 2010, 39(6): 985-988. LI Mingyuan, FAN Jinlian, CHENG Huichao, et al.Effects of TiC addition on the properties and microstructure of Mo-Ti alloy[J]. Rare Metal Materials and Engineering, 2010, 39(6): 985-988. [12] SINGH B N, EVANS J H, HORSEWELL A, et al.Microstructure and mechanical behaviour of TZM and Mo-5% Re alloys irradiated with fission neutrons[J]. Journal of Nuclear Materials, 1995, 223(2): 95-102. [13] KURISHITA H, KITSUMAI Y, SHIAYAMA T, et al. Development of Mo alloys with improved resistance to embrittlement by recrystallization and irradiation[J]. Journal of Nuclear Materials, 1996, 233/237(1): 557-564. [14] KITSUNAI Y, KURISHITA H, NARUI M, et al.Effect of neutron irradiation on low temperature toughness of TiC-dispersed molybdenum alloys[J]. Journal of Nuclear Materials, 1996, 239(1): 253-260. [15] KURISHITA H, ASAYAMA M, TOKUNAGA O, et al.Effect of TiC addition on the intergranular brittleness in molybdenum[J]. Materials Transactions, 2007, 30(12): 1009-1015. [16] 张久兴, 姚草根. 掺杂复合稀土氧化物的钼的组织与性能[J].稀土, 1999, 20(5): 22-26. ZHANG Jiuxing, YAO Caogen.Microstructure and properties of molybdenum doped with rare earth oxides[J]. Rare Earth, 1999, 20(5): 22-26. [17] 谭望, 陈畅, 汪明朴, 等. 不同因素对钼及钼合金塑脆性能影响的研[J]. 材料导报, 2007, 21(8): 80-83. TAN Wang, CHEN Chang, WANG Mingpu, et al.Influence of different factors on the brittleness and properties of molybdenum and molybdenum alloys[J]. Materials Review, 2007, 21(8): 80-83.
2018, Vol. 23 
