CAJ | 학술논문

研究Ni-Al-Fe系中B2型金属间化合物NiAl(Fe)的硬度随时效时间的变化,同时测定时效处理后含析出相的NiAl(Fe)金属间化合物的屈服强度随温度变化.结果表明,在所有实验温度区域内,NiAl(Fe)化合物的屈服强度均远高于单相NiAl;析出相为体心立方结构的α-Fe相;在时效初期α-Fe相呈球状,过时效之后变成平行于有序基体(100)晶面的板条状.通过透射电镜观察还确定变形过程中位错滑移矢量为<111>.虽然α-Fe析出相的硬度低于NiAl(Fe)基体,但由于α-Fe析出相对运动位错有较强的钉扎作用而使基体得到强化.
연구Ni-Al-Fe계중B2형금속간화합물NiAl(Fe)적경도수시효시간적변화,동시측정시효처리후함석출상적NiAl(Fe)금속간화합물적굴복강도수온도변화.결과표명,재소유실험온도구역내,NiAl(Fe)화합물적굴복강도균원고우단상NiAl;석출상위체심립방결구적α-Fe상;재시효초기α-Fe상정구상,과시효지후변성평행우유서기체(100)정면적판조상.통과투사전경관찰환학정변형과정중위착활이시량위<111>.수연α-Fe석출상적경도저우NiAl(Fe)기체,단유우α-Fe석출상대운동위착유교강적정찰작용이사기체득도강화.
Changes of hardness of B2-NiAl(Fe) intermetallic compounds in Ni-Al-Fe system with aging time and changes of yield strength of aged B2-NiAl(Fe) intermetallic compounds containing α-Fe precipitates with temperatures were investigated. Results show that the yield strength of B2-NiAl(Fe) intermetallic compounds containing α-Fe precipitates is higher than that of single phase NiAl at all the testing temperatures. It is revealed that the precipitates are disordered bcc Fe phase. The shape of a-Fe precipitates is sphericity and keeps coherent with the matrix in the initial aging period. With prolonging the aging time, the precipitates are platelet in shape, nearly parallel to the {100} planes of the B2-ordered matrix. TEM observation determines that the Burgers vector of the slipping dislocation is <111>. Although the hardness of α-Fe precipitates is lower than that of B2-NiAl(Fe) matrix, the pinning effect of the α-Fe precipitates on moving dislocation plays an important role in hardening of the B2-NiAl(Fe) matrix.