铁锰基合金的弹性和滞弹性的物理基础与恒弹性合金设计

The purpose of the project is to develop a new Elinvar alloy, which can be used in the temperature ranges from 200 to 340 kelvin. The Young’s modulus (E), delta-E effect (.E) and temperature coefficient of Young's modulus ( βE) in antiferromagnetic Fe-Mn based alloys have been investigated intensively by changing the alloying elements such as Mn, Al, Cr, Si and Co and its content in this work..We have found an alloying method to make some new antiferromagnetic Fe-Mn based Elinvar alloys. By testing, the properties of the new alloys such as βE , less than 2×10-5/K , and the mechanical quality.factor (Q) , in the ranges from 1500 to 8000, have come to meet the standards for the ferromagnetic Fe-Ni based and Fe-Co based alloys. By detesting the lattice parameters and measuring linear expansive.coefficient, it is found the origin of delta-E effect is caused by the Neel transition in which the expansion.occurs in antiferromagnetic state. Mossbauer results indicate that the additions of Si, Al into gamma-Fe-Mn alloys have a strong effect on the environment surrounding of Fe nucleus and increase the hyperfine field, which induces localised net magnetic moment at Fe site. But hyperfine field is affected little by the additions of Co and Cr into gamma-Fe-Mn alloys. The Elinvar properties could be improved by moderating the itinerant electron characterization and the shell electron in antiferromagnetic elinvar alloy should be consist of the itinerant electron and localised electron. The itinerant electron characterization of gamma-Fe-Mn alloys were weaken by adding one or more elements, such as Al, Cr, Si, Ge, Co and V, to the gamma-Fe-Mn alloys. The textures , which are formed in the.Elinvar Fe-Mn based alloy by cold rolling, will cut down .E effect and the value Q of the alloy, and can widen the temperature range that shows a good Elinvar characteristic. After tempering at low.temperature, Elinvar characteristic will be improved. But the temperature coefficient of Young's modulus ( βE) is affected little by the V4C3 deposite hardening. The internal friction results show strengthening Fe-Mn alloys will degrade internal friction Q-1 and a large Q-1 will be obtained when γ.ε.transformation. The Q-1 is enlarged with increasing the cold rolling deformation.

研究铁锰合金△Ｅ效应和滞弹性行为与合金元素铝、硅、锗，铬和钒的影响规律及其物理机制。探讨这些合金元素弱化铁锰合金巡游电子特性的程度的定性解释。探索铁锰基恒弹性合金可控Ｑ值的原理与工艺。以实验论证铁锰基恒弹性合金宜是巡游电子态与局域电子态混合型反铁磁体的假设。初步奠定反铁磁恒弹性合金理论基础，发明１－２种反铁磁恒弹性合金。