科学工作者通过各种技术方法，已经在很大程度上提高了TiAl基合金的性能

科学工作者通过各种技术方法，已经在很大程度上提高了TiAl基合金的性能，目前提高γ-TiAl合金性能的一种有效方法是微合金化，往TiAl合金中掺杂一定量的Nb，Cr，Zr，W等元素，该方法能改变合金的电子结构，结合键类型和强度，以及长程有序化程度，从而改变合金的微观组织结构，有可能进一步提高其韧性、塑形、强度、抗氧化以及抗蠕变等性能[6][7]。
为了获取合金化方法提高TiAl 基合金性能的理论依据，许多科研人员进行了大量理论研究和探索。例如，Gerling等[8]发现，Nb替代Ti原子可以提高TiAl合金的抗蠕变性和高温抗氧化性；Morinaga等[9]指出，用具有d电子轨道的过渡金属部分取代Al，可以提升TiAl基合金的韧性；陈律等[10]对3d过渡金属元素搀杂L10-TiAl金属间化合物的力学性质进行了系统研究；陈律等[11]研究了4d过渡金属在L10-TiAl 中的占位问题；刘显坤等[12]报道了5d过渡金属掺杂γ-TiAl合金的第一性原理研究；宋庆功等[13]进行了4d过渡金属替位掺杂γ-TiAl基合金的第一性原理研究。
目前为止，研究者已经进行了多种过渡金属元素对γ-TiAl合金的单掺杂，双掺杂等的理论研究，但是掺杂浓度和实际生产浓度相比略高，在低浓度情况下掺杂γ-TiAl合金的研究还未见人报道，因此本论文尝试用计算结合理论方法研究掺杂浓度对γ-TiAl合金的结构和性质影响。
在工业生产中，多种相关合金已经取得一定应用，比如说Ti–48Al–2Cr– 2Nb在涡轮叶片上的应用，该合金Cr，Nb的原子比例均为2%，浓度较低，所以本论文希望通过研究低浓度掺杂后的合金性质，与实际材料性质进行比较，对比分析，在此基础上改进掺杂结构和比例，期待研究出性能更加优良的材料。
本论文通过杂质浓度对M掺杂γ-TiAl合金结构和性质的研究，在重要基础问题上取得经验，对于TiAl基合金在航空航天领域的应用，拓展TiAl基合金的研究和加工技术，有着重要的意义。

結果 (英文) 1:

Science workers through various technology method, has in is big degree Shang improve has TiAl base alloy of performance, currently improve gamma-TiAl alloy performance of a effective method is micro alloy of, to TiAl alloy in the doping must volume of Nb,Cr,Zr,W, elements, the method can change alloy of electronic structure, combines key type and strength, and long-range ordered of degree, thus change alloy of micro organization structure, has may further improve its toughness, and plastic shaped, and strength, and Antioxidant properties such as creep resistance [6][7].In order to obtain alloys-method of improving the properties of TiAl-based alloy theory, many scientists have done a lot research and exploration. Such as, Gerling, [8] found, Nb alternative Ti Atomic can improve TiAl alloy of anti-creep degeneration and high temperature anti-oxidation sex; Morinaga, [9] pointed out that, with has d electronic track of transition metal part replaced Al, can upgrade TiAl base alloy of toughness; Chen Lv, [10] on 3D transition metals mixed miscellaneous L10-TiAl metal between compounds of mechanical nature for has system research; Chen Lv, [11] Research problems in transition metal L10-TiAl 4d; Liu Xiankun, [12] reported 5d first-principles of transition metal doped γ--TiAl alloys studies; Song Qinggong [13] in 4d doped with transition metal substituted first-principles study of γ--TiAl base alloy.So far, researchers have carried out a variety of transition metal elements of γ--TiAl alloy single-doping, doping, such as the theory of doping concentrations and concentrations slightly higher than the actual production but, at low concentrations of γ--TiAl alloys doped with research has not been reported, so this paper attempts to calculate theoretical methods to study doping effects on structures and properties of γ--TiAl alloy. In industrial production in the, variety related alloy has made must application, like Ti – 48Al – 2Cr – 2Nb in Turbo leaves Shang of application, the alloy Cr,Nb of Atomic proportions are for 2%, concentration lower, so this papers hopes through research low concentration doping Hou of alloy nature, and actual material nature for compared, compared analysis, this based Shang improved doping structure and proportions, looks forward to research out performance more excellent of material.This paper by m doping impurity concentration on study on structures and properties of γ--TiAl alloys, in an important issue on the basis of experience, TiAl-base alloys in aerospace applications, expanding research and processing technology of TiAl-based alloy, is of great significance.

結果 (英文) 3:

Scientific workers through various technical method, have improved the performance of TiAl based alloy in the very great degree, at present an effective method to improve the performance of gamma -TiAl alloys is micro alloying, to TiAl alloy doped amount of Nb, Cr, Zr, W and other elements, the method can change the electronic structure of gold, bond type and intensity, and long range ordering degree, to change the microstructure of alloy, it is possible to further improve the toughness, strength, shaping, antioxidant and anti creep properties of [6][7].
in order to obtain the alloying method and theoretical basis for improving the performance of TiAl based alloy,Done a lot of theoretical research and exploration of many scientific research personnel. For example, Gerling [8] found that the substitution of Ti atoms, Nb can improve the TiAl alloy creep resistance and high temperature oxidation resistance; Morinaga [9] points out, replaced by Al transition metal parts with d electronic track, can improve the toughness of TiAl based alloy; mechanical properties of Chen law to 3d transition elements doped [10] Jin Shuyuan L10-TiAl intermetallic compounds were systematically studied; Chen law [11] studied in L10-TiAl occupying 4D transition metal; Liu Xiankun et [12] reported the first principle study of 5D transition metal doped gamma -TiAl alloys;Song Qinggong [13] was the first principles study of substitutional doping of -TiAl based alloy 4D transition metal.
so far, researchers have carried on the single doping many transition metal elements on the gamma -TiAl alloys, theoretical study of double doping, but compared to the doping concentration and the actual production concentration was slightly higher, in the case of low concentration of doped -TiAl alloys have not see gamma reports, so this thesis attempts to use the calculation of effects of combining research theory and method of structure and properties of doped concentration of gamma -TiAl alloys.
in industrial production, a variety of related alloy has achieved a certain application,For example the application of Ti - 48Al - 2Cr - 2Nb on the turbine blades, the alloy Cr, Nb atomic ratio was 2%, concentration is low, so this paper hope alloy properties of low concentration doped, compared with the actual material properties, comparative analysis, based on this improved doping structure and proportion, I hope to find out a more excellent performance materials. This paper through the impurity concentration
on the structure and properties of M doped -TiAl intermetallic alloy research, gain experience in fundamental questions, for the application of TiAl based alloys in aerospace field, development of TiAl based alloy and processing technology research, has the vital significance.