Y2O3–CeO2双相弥散强化对Mo合金晶粒度及拉伸性能的影响

段琳琳; 冯鹏发; 党晓明

doi:10.19591/j.cnki.cn11-1974/tf.2021030006

Y₂O₃–CeO₂双相弥散强化对Mo合金晶粒度及拉伸性能的影响

doi: 10.19591/j.cnki.cn11-1974/tf.2021030006

段琳琳^{1, 2, ,},
冯鹏发^{1, 2},
党晓明^{1, 2}

1.
金堆城钼业股份有限公司，西安 710077
2.
西安建筑科技大学功能材料加工国家地方联合工程研究中心，西安 710077

基金项目: 国家重点研发计划专项资助项目（2017YFB0306000，2017YFB0305600）

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E-mail：duanll99@sina.com

中图分类号: TG146.4+12
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出版历程
- 收稿日期: 2021-03-02
- 刊出日期: 2021-06-25

Effect of Y₂O₃–CeO₂ two-phase dispersion strengthening on the grain size and tensile properties of Mo alloys

DUAN Lin-lin^{1, 2
, ,},
FENG Peng-fa^{1, 2},
DANG Xiao-ming^{1, 2}

1.
Jinduicheng Molybdenum Co., Ltd., Xi’ an 710077, China
2.
National and Local Joint Engineering Research Center for Functional Materials Processing, Xi’ an University of Architecture and Technology, Xi’ an 710077, China

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Corresponding author: E-mail: duanll99@sina.com

摘要

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（Y₂O₃）和氧化铈（CeO₂）的Mo–Y–Ce合金，分析了Y₂O₃和CeO₂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，Y₂O₃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Y₂O₃掺杂量密切相关，当Y₂O₃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；CeO₂因与Mo基体具有半共格关系而具有较好的韧化效果，当CeO₂质量分数为0.06%～0.08%时，Mo–Y–Ce合金烧结态晶粒尺寸达10 μm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–0.6Y₂O₃–(0.06~0.08)CeO₂。
- 双相弥散强化 /
- Mo合金 /
- 合金丝 /
- 晶粒度 /
- 力学性能
Abstract: Mo–Y–Ce alloys doped by yttrium oxide (Y₂O₃) and cerium oxide (CeO₂) in different mass fraction were prepared by the nanometer spray doping technology and the powder metallurgy method. The two-phase dispersion strengthening effect of Y₂O₃ and CeO₂ on the grain size and mechanical properties of Mo alloys at room temperature was studied. The results show that Y₂O₃ 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 Y₂O₃. When the mass fraction of Y₂O₃ is 0.60%, the tensile strength and yield strength of the ϕ1.8-mm Mo–Y alloy wires reach 1050 and 923 MPa, respectively. Because of the semi-coherent relationship between CeO₂ and the Mo matrix, CeO₂ has the good toughening effect. When the mass fraction of CeO₂ is 0.06%~0.08%, the grain size of the sintered Mo–Y–Ce alloys is smaller than 10 μm, the tensile strength and yield strength of the ϕ1.8-mm Mo–Y–Ce alloy wires are 1130 and 1018 MPa, respectively, the elongation reaches 28.5%. The tensile strength of ϕ0.18-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–0.6Y₂O₃–(0.06~0.08)CeO₂.
- two-phase dispersion strengthening /
- Mo alloys /
- alloy wires /
- grain size /
- mechanical properties

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图 1 ϕ1.8-mm Mo–Y合金丝室温力学性能与Y₂O₃质量分数

Figure 1. Mechanical properties of the ϕ1.8-mm Mo–Y alloy wires with the different mass fraction of Y₂O₃ at the room temperature

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图 2 ϕ0.18-mm Mo–Y合金丝的抗拉强度与Y₂O₃质量分数

Figure 2. Tensile strength of the ϕ0.18-mm Mo–Y alloy wires with the different mass fraction of Y₂O₃

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图 3 ϕ0.18-mm Mo–Y合金丝室温拉伸断口形貌：（a）Mo–0.47Y₂O₃；（b）Mo–0.6Y₂O₃；（c）Mo–0.8Y₂O₃；（d）Mo–1.0Y₂O₃

Figure 3. Tensile fracture of the ϕ0.18-mm Mo–Y alloy wires at the room temperature: (a) Mo–0.47Y₂O₃; (b) Mo–0.6Y₂O₃; (c) Mo–0.8Y₂O₃; (d) Mo–1.0Y₂O₃

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图 4 ϕ1.8-mm Mo–Y–Ce合金丝室温力学性能与CeO₂质量分数

Figure 4. Mechanical properties of the ϕ1.8-mm Mo–Y–Ce alloy wires with the different mass fraction of CeO₂ at the room temperature

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图 5 ϕ0.18-mm Mo–Y–Ce合金抗拉强度与CeO₂质量分数

Figure 5. Tensile strength of the ϕ0.18-mm Mo–Y–Ce alloy wires with the different mass fraction of Y₂O₃

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图 6 ϕ0.18-mm Mo–0.6Y₂O₃–0.08CeO₂合金丝室温拉伸断口形貌

Figure 6. Tensile fracture surface of the ϕ0.18-mm Mo–0.6 Y₂O₃–0.08CeO₂ alloy wires at the room temperature

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图 7 ϕ0.18-mm Mo–0.6Y₂O₃–0.08CeO₂合金烧结态金相组织

Figure 7. Metallographic structure of the sintered ϕ0.18-mm Mo–0.6Y₂O₃–0.08CeO₂ alloys

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表 1 Mo–Y合金丝中Y₂O₃设计成分

Table 1. Composition of Y₂O₃ in the Mo–Y alloy wires

编号	1#	2#	3#	4#
Y₂O₃质量分数 / %	0.47	0.60	0.80	1.00

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表 2 Mo–0.6Y₂O₃–Ce合金丝中CeO₂设计成分

Table 2. Composition of CeO₂ in the Mo–0.6Y₂O₃–Ce alloy wires

编号	1#	2#	3#	4#	5#
CeO₂质量分数 / %	0.03	0.06	0.08	0.12	0.15

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表 3 ϕ1.8-mm Mo–Y合金丝室温力学性能

Table 3. Mechanical properties of the ϕ1.8-mm Mo–Y alloy wires at the room temperature

Mo–Y合金	屈服强度 / MPa	抗拉强度 / MPa	延伸率 / %	屈强比
Mo–0.47Y₂O₃	920	1045	11.7	0.88
Mo–0.6Y₂O₃	923	1050	14.0	0.90
Mo–0.8Y₂O₃	875	993	12.5	0.88
Mo–1.0Y₂O₃	850	973	9.0	0.87

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表 4 ϕ0.18-mm Mo–Y合金丝的抗拉强度

Table 4. Tensile strength of the ϕ0.18-mm Mo–Y alloy wires

Mo–Y合金	抗拉强度 / MPa
Mo–0.47Y₂O₃	2226
Mo–0.6Y₂O₃	2363
Mo–0.8Y₂O₃	2226
Mo–1.0Y₂O₃	2120

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表 5 ϕ1.8-mm Mo–Y–Ce合金丝室温力学性能

Table 5. Mechanical properties of the ϕ1.8-mm Mo–Y–Ce alloy wires at the room temperature

Mo–Y–Ce合金	屈服强度 / MPa	抗拉强度 / MPa	延伸率 / %	屈强比
Mo–0.6Y₂O₃–0.03CeO₂	883	1005	22.7	0.88
Mo–0.6Y₂O₃–0.06CeO₂	1018	1130	24.0	0.90
Mo–0.6Y₂O₃–0.08CeO₂	868	968	28.5	0.89
Mo–0.6Y₂O₃–0.12CeO₂	975	1087	25.8	0.90
Mo–0.6Y₂O₃–0.15CeO₂	890	987	25.0	0.91

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表 6 ϕ0.18-mm Mo–Y–Ce合金丝抗拉强度

Table 6. Tensile strength of the ϕ0.18-mm Mo–Y–Ce alloy wires

Mo–Y–Ce合金	抗拉强度 / MPa
Mo–0.6Y₂O₃–0.03 CeO₂	2075
Mo–0.6Y₂O₃–0.06 CeO₂	2235
Mo–0.6Y₂O₃–0.08 CeO₂	2510
Mo–0.6Y₂O₃–0.12 CeO₂	2510
Mo–0.6Y₂O₃–0.15 CeO₂	2320

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