Enhanced mechanical properties of molybdenum alloy originating from composite strengthening of Re and CeO_(2)  

铼及二氧化铈复合强化钼合金的力学性能

作　　者：Meng-yao ZHANG Shuai MA Xin LI Ye GAO Zhuang-zhi WU De-zhi WANG 张梦瑶;马帅;李鑫;高野;吴壮志;王德志(中南大学材料科学与工程学院,长沙410083;中南大学粉末冶金国家重点试验室,长沙410083)

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China [2]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第10期3295-3308,共14页中国有色金属学报（英文版）

基　　金：supported by the National Key R&D Program of China(No.2022YFB3705402)。

摘　　要：To enhance the mechanical properties of molybdenum alloys at both room and high temperatures,Mo-14Re-1CeO_(2)alloy was synthesized using the powder metallurgy method,and the corresponding microstructure and mechanical properties were characterized.The results indicate that the ultimate tensile strength of Mo-14Re-1CeO_(2)reaches 657 MPa,with a total elongation of 35.2%,significantly higher than those of pure molybdenum(453 MPa,and 7.01%).Furthermore,the compression strength of Mo-14Re-1CeO_(2)at high temperature(1200℃)achieves 355 MPa,which is still larger than that of pure molybdenum(221 MPa).It is revealed that there is a coherent interface between CeO_(2)and the Mo-14Re matrix with CeO_(2)particles uniformly distributed in both intergranular and intragranular regions.The improvements in mechanical properties are primarily attributed to the formation of Mo-Re solid solution,grain refinement,and dispersion strengthening effect of CeO_(2).为了提高钼合金在常温及高温条件下的力学性能,采用粉末冶金方法制备Mo-14Re-1CeO_(2)合金,并探究其微观结构和力学性能。结果表明,Mo-14Re-1CeO_(2)的极限抗拉强度达到657 MPa,总伸长率为35.2%,明显高于纯钼(453 MPa、7.01%)。另外,Mo-14Re-1CeO_(2)在高温(1200℃)下的压缩强度达到355 MPa,同样高于纯钼(221 MPa)。CeO_(2)与Mo-14Re基体间形成共格界面,且CeO_(2)颗粒均匀分布于晶界和晶内。该合金力学性能的提升主要归因于Mo-Re固溶体的形成、晶粒细化以及CeO_(2)颗粒的弥散强化效应。

关 键 词：molybdenum−rhenium alloy cerium oxide composite strengthening mechanical properties 

分 类 号：TG146.412[一般工业技术—材料科学与工程]