SPS烧结参数对NiAl-28Cr-5.5Mo-0.5Zr合金微观组织及室温力学性能的影响  

Influence of Spark Plasma Sintering Parameters on the Microstructure and Room-Temperature Mechanical Properties of NiAl-28Cr-5.5Mo-0.5Zr Alloy

作　　者：刘泽 宁汉维 林彰乾 王东君[1] LIU Ze;NING Hanwei;LIN Zhangqian;WANG Dongjun(School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《金属学报》2021年第12期1579-1587,共9页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目No.91860122。

摘　　要：以气雾化法制备的NiAl-28Cr-5.5Mo-0.5Zr (原子分数,%)预合金粉末为原料,采用放电等离子烧结(SPS)工艺制备了NiAl-28Cr-5.5Mo-0.5Zr块体合金(NiAl基合金),研究了烧结温度、保温时间对烧结态合金致密度、微观组织以及室温压缩性能的影响。结果表明,SPS烧结温度对烧结态合金的致密度以及室温压缩性能的影响较大,而保温时间对其影响相对较小。在优化的烧结参数下:烧结温度为1200℃、保温时间为3 min、烧结压力为50 MPa,NiAl基合金的压缩屈服强度、抗压强度、塑性变形量分别为1321.4 MPa、2360 MPa和0.313。此外,分析了SPS工艺制备NiAl-28Cr-5.5Mo-0.5Zr合金的微观致密化过程。As a potential high-temperature structural material,the practical application of NiAl intermetallic compound is limited because of its low plasticity and fracture toughness at room temperature and poor strength at high temperature.Adding alloying elements and optimizing the preparation process are effective ways to improve the material.s performance.In this study,NiAl-based alloys were prepared through spark plasma sintering using NiAl-28 Cr-5.5 Mo-0.5 Zr(atom fraction,%) prealloyed powders.The influence of sintering temperature and holding time on the density,microstructure,and room-temperature compression properties of the sintered alloys was studied.The microstructures of the sintered alloys were investigated using SEM,and their room-temperature compression properties were tested using an electronic universal testing machine.It is shown that the influence of spark plasma sintering temperature on the density and room-temperature compression properties of sintered alloys is significant while that of the holding time is weaker.Under optimal sintering parameters,i.e.,a sintering temperature of 1200 oC,holding time of 3 min,and sintering pressure of 50 MPa,the yield strength,compressive strength,and plasticity strain of the sintered alloy were 1321.4 MPa,2360 MPa,and 0.313,respectively.Additionally,the densification process of NiAl-28 Cr-5.5 Mo-0.5 Zr alloy prepared by spark plasma sintering was studied.

关 键 词：NIAL基合金 放电等离子烧结 微观组织 力学性能 致密化 

分 类 号：TG146[一般工业技术—材料科学与工程]