CAJ | 학술논문

通过对不同状态及不同Re含量单晶镍基合金进行高、低温X射线衍射谱线测定及组织形貌观察,研究Re含量及温度对单晶镍基合金中γ、γ'两相晶格常数及错配度的影响.结果表明:铸态合金中γ、γ'两相有较大的晶格常数及错配度;经完全热处理后,立方γ'相以共格方式嵌镶在γ基体中,合金中两相的晶格常数及错配度略有减小;长期时效使γ'相粗化后,两相之间出现界面位错,使合金中两相的晶格常数及错配度绝对值增加.随Re含量增加,合金中γ、γ'两相在室温的晶格常数增大,错配度的绝对值减小.与γ'相相比,γ基体相有较大的膨胀系数,因此,随温度提高,合金中两相晶格错配度的绝对值增大.
통과대불동상태급불동Re함량단정얼기합금진행고、저온X사선연사보선측정급조직형모관찰,연구Re함량급온도대단정얼기합금중γ、γ'량상정격상수급착배도적영향.결과표명:주태합금중γ、γ'량상유교대적정격상수급착배도;경완전열처리후,립방γ'상이공격방식감양재γ기체중,합금중량상적정격상수급착배도략유감소;장기시효사γ'상조화후,량상지간출현계면위착,사합금중량상적정격상수급착배도절대치증가.수Re함량증가,합금중γ、γ'량상재실온적정격상수증대,착배도적절대치감소.여γ'상상비,γ기체상유교대적팽창계수,인차,수온도제고,합금중량상정격착배도적절대치증대.
By means of X-ray diffraction analysis at different temperatures and microstructure observation, an investigation has been made on the influence of element Re and temperatures on the lattice parameter and the misfit of single-crystal nickel based superalloys. Results show that the bigger lattice parameter and misfit are displayed in as-cast superalloy. After fully heat treatment, the cubicγ' phase is coherently embedded in the γ matrix phase, and the lattice parameters and misfit ofγ' andγphases are slightly reduced. After aged for long time, the coarsening of γ' phase is in the alloy occurs, and the interfacial dislocations appear betweenγ' andγ phases, which increases the parameters and the absolute misfit ofγ' andγ phases. The lattice parameters ofγ' andγ phases in the alloys at room temperature increase with the element Re increasing, and the absolute values of the misfit decrease. Compared with the γ' phase is, theγ matrix phase displays a bigger dilation coefficient;therefore, the lattice parameters and the absolute misfit value ofγ' andγ phases in the alloy increase with the temperature increasing.