摘要
采用纳米喷雾掺杂技术和粉末冶金方法制备了含不同质量分数氧化钇(Y_(2)O_(3))和氧化铈(CeO_(2))的Mo–Y–Ce合金,分析了Y_(2)O_(3)和CeO_(2)双相弥散强化对Mo合金晶粒度和室温力学性能的影响。结果表明,Y_(2)O_(3)可抑制个别晶粒异常长大,并具有沉淀强化效果。Mo–Y合金丝的力学性能与Y_(2)O_(3)掺杂量密切相关,当Y_(2)O_(3)质量分数为0.60%时,φ1.8-mm Mo–Y合金丝抗拉强度为1050 MPa,屈服强度为923 MPa;CeO_(2)因与Mo基体具有半共格关系而具有较好的韧化效果,当CeO_(2)质量分数为0.06%~0.08%时,Mo–Y–Ce合金烧结态晶粒尺寸达10μm以下,φ1.8-mm Mo–Y–Ce合金丝抗拉强度为1130 MPa,屈服强度为1018 MPa,延伸率达到28.5%。φ0.18-mm Mo–Y–Ce合金丝抗拉强度达2510 MPa。实验优化出Mo–Y–Ce双相弥散强化Mo合金的最优成分为Mo–0.6Y_(2)O_(3)–(0.06~0.08)CeO_(2)。
Mo–Y–Ce alloys doped by yttrium oxide(Y_(2)O_(3))and cerium oxide(CeO_(2))in different mass fraction were prepared by the nanometer spray doping technology and the powder metallurgy method.The two-phase dispersion strengthening effect of Y_(2)O_(3) and CeO_(2) on the grain size and mechanical properties of Mo alloys at room temperature was studied.The results show that Y_(2)O_(3) restrains the abnormal growth of the individual grains and has the effect of precipitation strengthening.The mechanical properties of the Mo–Y alloy wires are closely related to the doping amount of Y_(2)O_(3).When the mass fraction of Y_(2)O_(3) is 0.60%,the tensile strength and yield strength of theϕ1.8-mm Mo–Y alloy wires reach 1050 and 923 MPa,respectively.Because of the semi-coherent relationship between CeO_(2) and the Mo matrix,CeO_(2) has the good toughening effect.When the mass fraction of CeO_(2) is 0.06%~0.08%,the grain size of the sintered Mo-Y-Ce alloys is smaller than 10μm,the tensile strength and yield strength of theϕ1.8-mm Mo-Y-Ce alloy wires are 1130 and 1018 MPa,respectively,the elongation reaches 28.5%.The tensile strength ofϕ0.18-mm Mo-Y-Ce alloy wires reaches 2510 MPa.The optimal composition of the Mo-Y-Ce two-phase dispersion strengthening Mo alloys is Mo-0.6Y_(2)O_(3)-(0.06~0.08)CeO_(2).
作者
段琳琳
冯鹏发
党晓明
DUAN Lin-lin;FENG Peng-fa;DANG Xiao-ming(Jinduicheng Molybdenum Co.,Ltd.,Xi’an 710077,China;National and Local Joint Engineering Research Center for Functional Materials Processing,Xi’an University of Architecture and Technology,Xi’an 710077,China)
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2021年第3期223-228,共6页
Powder Metallurgy Technology
基金
国家重点研发计划专项资助项目(2017YFB0306000,2017YFB0305600)。
关键词
双相弥散强化
MO合金
合金丝
晶粒度
力学性能
two-phase dispersion strengthening
Mo alloys
alloy wires
grain size
mechanical properties
