轧制Mo-14%Re合金的显微组织和室温拉伸性能  

Microstructure and Room Temperature Tensile Properties of Rolled Mo-14%Re Alloy

作　　者：何朝军 胡平[1,2] 邢海瑞 杨帆[1,2] 张向阳[1,2] 林小辉 华兴江[1,2] 白润 张文[3] 王快社[1,2] He Chaojun;Hu Ping;Xing Hairui;Yang Fan;Zhang Xiangyang;Lin Xiaohui;Hua Xingjiang;Bai Run;Zhang Wen;Wang Kuaishe(School of Metallurgy Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;National and Local Joint Engineering Research Center for Functional Materials Processing,Xi'an University of Architecture and Technology,Xi'an 710055,China;Northwest Institute for Nonferrous Metal Research,Xi'an 710016,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [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,陕西西安710055 [3]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2023年第8期2746-2756,共11页Rare Metal Materials and Engineering

基　　金：National Key R&D Program of China(2022YFB3705400);Major Scientific and Technological Projects in Shaanxi Province of China(2020ZDZX04-02-01);Scientific and Technological Innovation Team Project of Shaanxi Innovation Capability Support Plan of China(2022TD-30);the Fok Ying Tung Education Foundation(171101);Youth Innovation Team of Shaanxi Universities(2019-2022);Top Young Talents Project of“Special Support Program for High level Talents”in Shaanxi Province(2018-2023);China Postdoctoral Science Foundation(2021M693878);Service Local Special Program of Education Department of Shaanxi Province,China(21JC016);Key R&D Program of Shaanxi Province,China(2021GY-209)。

摘　　要：为了进一步了解轧制Mo-14%Re合金的显微组织和室温拉伸性能,采用扫描电镜(SEM)和高分辨电子背散射衍射(EBSD)研究了轧制Mo-14%Re合金的显微组织和断口形貌。采用Channel 5软件分析了轧制Mo-14%Re合金在不同退火温度下的组织演变。结果表明,随着退火温度的升高,Mo基体相和ReO_(3)相的施密特因子逐渐减小。织构强度迅速增加,极图上的晶体取向强度从6.51增加到10.18。轧制Mo-14%Re合金的初始再结晶发生在1100℃,在此退火温度下,合金中富稀土ReO_(3)相均匀析出,导致拉伸过程中应力分布均匀,Mo基体相和ReO_(3)相表现出明显的晶体取向,ReO_(3)相晶界主要为大角度晶界,使得断后伸长率达到最大值33.5%。拉伸断裂的韧窝数量最多且最大。此外,还研究了断裂过程中微孔的形成、聚集、生长和裂纹扩展。Mo-Re alloys have excellent mechanical and processing properties due to their high-temperature resistance,corrosion resistance,and plasticity.To further understand the microstructure and room temperature tensile properties of rolled Mo-14%Re alloy,the microstructure and fracture morphology of the Mo-14%Re alloy were investigated by scanning electron microscopy(SEM)and high-resolution electron backscatter diffraction(EBSD).Channel 5 software was used to analyze the microstructure evolution of rolled Mo-14%Re alloy at different annealing temperatures.With the increase in annealing temperature,the Schmidt factor of the Mo matrix phase and ReO_(3) phase decreases gradually.The texture intensity increases rapidly,and the crystal orientation intensity of the polarography increases from 6.51 to 10.18.The initial recrystallization of the rolled Mo-14%Re alloy occurs at 1100°C,at which the uniform precipitation of the earth-rich ReO_(3) phase in the alloy leads to uniform stress distribution during tensile process,the grains of Mo matrix phase and ReO_(3) phase show obvious<101>crystal orientation and<111>crystal orientation,and the grain boundaries of ReO_(3) phase are mainly high-angle grain boundaries,which makes the elongation after fracture reach the maximum of 33.5%.The tensile fracture has the highest number of dimples and the largest size.Besides,the formation,aggregation,growth,and crack propagation of micropores during fracture were studied.

关 键 词：Mo-14%Re合金 室温拉伸 初始再结晶 微观结构演化 裂纹扩展 

分 类 号：TG146.412[一般工业技术—材料科学与工程]