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Nucleation and growth of L1_(2)-Al_(3)RE particles in aluminum alloys:A first-principles study

Journal of Rare Earths 2023年第7期41卷 1116-1126,I0005页

作者： Touwen Fan zixiong ruan Feng Zhong Chaoyang Xie Xiaofeng Li Dongchu Chen Pingying Tang Yuanzhi Wu College of Science Hunan Institute of TechnologyHengyang 421002China Research Institute of Automobile Parts Technology Hunan Institute of TechnologyHengyang 421002China School of Materials Science and Engineering North University of Chin1Taiyuan 030051China School of Material Science and Hydrogen Energy Engineering Foshan UniversityFoshan 528001China Key Laboratory of New Electric Functional Materials of Guangxi Colleges and Universities Nanning Normal UniversityNanning 530023China

The internal mechanisms of nucleation and growth of L1_(2)-AI_(3)RE(RE=Sc,Y,La-Lu) second phases in Al alloys were investigated by combining first-principles calculations with quasi-harmonic approximation(QHA).The calculated results show that the diffusion rate D_s and chemical potential AG_V increase with the increase of *** the increase of atomic number,the D_s and the strain energy ΔE_(CS)increase firstly from Sc to La,and then decreases,while the calculated interface energy γ_(α/β) and ΔG_V show opposite *** on above calculated results,the critical nucleation radius R*and coarsening rate K_(LSW) are obtained from the classical nucleation theory(CNT) and LSW model of the Ostwald ripening of particles,*** the increase of atomic number,the R*increases firstly,and then decreases for all planes at finite *** the K_(LSW) shows opposite variation to the R^(*).From this point of view,it is reasonably speculated that Y and later RE elements can replace the expensive Sc for heat-resistance Al *** solubility c_(∞) of particles is usually very small at low temperature,and there is obvious solubility only when the temperature reaches 600 *** surface energies E_(sur) of AI_(3)RE compounds and Al solid solution are respectively larger and smaller than that of pure Al,respectively,except for the surface(001) and(110) of Al_(3)*** all planes,with the increase of atomic number of RE,E_(sur) decreases firstly from Sc to La,and then increases linearly to *** results are helpful for designing high performance heat-resistance Al alloys.

关键词： First-principles calculations Diffusion rate Quasi-harmonic approximation Particle nucleation and growth Rare earths

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Validation of spectrum method for improving efficiency of continuous-wave ＆ Q-switched Tm-doped yttrium aluminum garnet laser

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Science China(Physics,Mechanics & Astronomy) 2018年第3期61卷 77-80页

作者： HaiZhou Huang Pan Gao HuaGang Liu Jian-Hong Huang Juan Wang KaiMing ruan Wen Weng Hui Zheng zixiong Lin ShuTao Dai Jing Deng WenXiong Lin Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China University of Chinese Academy of Sciences Beijing 100049 China

Tm3＋-doped 2-μm lasers benefit many applications such as atmospheric sensing, medical treatment, and spec- troscopy [1-3]. Therefore, in the past two decades, both continuous-wave （CW） and pulse operations have be... 详细信息

关键词：钇铝石榴石激光波浪谱方法切换 Tm 医疗纤维

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