CAJ | 학술논문

采用单辊快速凝同法制备出厚约40μm的Mg_(80)Cu_(15)Y_5非品合金薄带,利用XRD、DSC、TEM和HRTEM研究了非品合金的非品形成能力和晶化行为,分析了品化对合金组织结构与性能的影响.结果表明:Mg_(80)Cu_(15)Y_5合金的过冷液态温度区间△T_x和约化玻璃转变温度T_(rg)分别为55K和0.58,表明其具有较强的非晶形成能力;该合金在退火温度高于473 K后发牛明显晶化,从非品基体中析出 Mg_2Cu、Cu_2Y和Mg晶体相;随着退火温度的升高,合金的硬度呈现出先升高后降低的变化趋势,这与纳米品体相颗粒的弥散析出、重溶及粗化有关.
채용단곤쾌속응동법제비출후약40μm적Mg_(80)Cu_(15)Y_5비품합금박대,이용XRD、DSC、TEM화HRTEM연구료비품합금적비품형성능력화정화행위,분석료품화대합금조직결구여성능적영향.결과표명:Mg_(80)Cu_(15)Y_5합금적과랭액태온도구간△T_x화약화파리전변온도T_(rg)분별위55K화0.58,표명기구유교강적비정형성능력;해합금재퇴화온도고우473 K후발우명현정화,종비품기체중석출 Mg_2Cu、Cu_2Y화Mg정체상;수착퇴화온도적승고,합금적경도정현출선승고후강저적변화추세,저여납미품체상과립적미산석출、중용급조화유관.
Mg_(80)Cu_(15)Y_5 amorphous alloy ribbons with the thickness of approximately 40 μm were prepared by single-roll rapid solidification method.The amorphous-forming ability and crystallization behavior were studied using XRD,DSC,TEM and HRTEM.The effects of crystallization on microstructure and mechanical property of the alloy were analyzed.The results show Mg_(80)Cu_(15)Y_5 alloy has better amorphous-forming ability,the undercooled liquid region ΔT_x is 55 K and the reduced glass-transition temperature T_(rg)is 0.58.The remarkable crystallization of the alloy occurs after annealing above 473 K.Mg_2Cu,Cu_2Y and Mg crystalline phases are precipitated from the amorphous matrix.With the increase of annealing temperature,the microhardness of the alloy increases first and then decreases.The change in the microhardness of the alloy depends on the precipitation,re-melting and coarsening of the nano-crystalline particles.