中国大功率激光装备的发展

简要介绍了国内大功率激光装备发展的现状,同时预测分析了大功率激光装备市场发展的趋势,重点阐述了对激光装备产业化发展的见解.     

如何振兴我国机床工业和加速NC机床的发展

本文结合世界机床发展历史与我国机床发展历程，全面论述了机床的特点及世界机床技术的发展。叙述了ＮＣ机床的特点及其发展规律，我国ＮＣ机床发展的经过及现状，提出了如何振兴我国机床工业和加速发展ＮＣ机床的方针政策、策略及具体措施。     

中国铝用炭素50年技术创新的回顾与展望

本文论述了炭素材料和电解铝相互促进发展的关系,回顾了我国铝用炭素50年的技术发展历程和主要的技术创新点,展望将来铝用炭素的技术发展,提出了发展方向和思路。     

文化产业理论发展研究

首先回顾了西方文化产业理论的发展过程,接着分析了文化产业理论的发展特点和趋势,最后结合我国文化产业的发展提出了若干对策与建议.     

中国压铸行业现状及发展趋势

中国汽车工业的迅速发展促进了压铸行业的发展。作者列举了有关压铸行业的厂点、压铸设备以及压铸件产量等方面的基本数据；分析了压铸市场的发展趋势；阐述了压铸行业的发展对策。认为中国经济的持续增长，特别是汽车工业十五年发展规划，将推动中国压铸行业进入一个高速度发展的新时代     

广东省铝型材发展状况

简介了广东省铝型材发展的四个阶段,分析了广东省铝型材发展的几大特点,探讨了广东省铝型材生产发展中要注意的几个问题。     

高速列车制造焊接技术应用展望

高速列车制造产业的发展将带动国内焊接技术的研究和新型焊接技术的推广.介绍了高速列车车体结构,高速列车发展对焊接技术发展的需求,概括了目前存在的问题.针对高速列车焊接技术的发展要求,对新型电弧焊技术、焊接材料等方面的需求进行了总结,提出了归纳建议,并且对发展方向进行了预测.     

中国压铸行业现状及发展趋势

中国汽车工业的迅速发展促进了压铸行业的发展。作者列举了有关压铸行业的厂点、压铸设备以及压铸件产量等方面的基本数据 ;分析了压铸市场的发展趋势 ;阐述了压铸行业的发展对策。认为中国经济的持续增长 ,特别是汽车工业十五年发展规划 ,将推动中国压铸行业进入一个高速度发展的新时代     

中国压铸业发展的回顾与展望

中国压铸业的发展已有60余年的历史,改革开放以后,随着我国国民经济的发展,各个工业领域突飞猛进,从而推动了压铸业逐渐发展,使其成为铸造行业中的佼佼者,至今仍然充满着持续发展的旺盛势头.该文对建国以来我国压铸业的不同发展阶段,在合金材料、压铸设备、压铸工艺和模具技术等方面进行了回顾和总结,介绍了压铸企业、压铸市场和区域发展等情况,并与同时期国际压铸发展水平进行了对比.展望了我国未来压铸发展的市场前景、产业结构和工艺技术发展趋势等.     

我国超硬刀具高速切削技术发展现状、问题及前景

本文介绍了国内外高速切削技术的发展历程及其与超硬刀具技术发展中的相互关系,分析了国内超硬刀具高速切削技术发展中存在的主要问题,最后对国内超硬刀具高速切削技术发展前景进行了展望,并对以后的发展提出了建议。     

Nucleation potency prediction of LaB6 with E2EM model and its influence on microstructure and tensile properties of Al-7Si-0.3Mg alloy

The edge-to-edge matching (E2EM) crystallographic model was used to predict the orientation relationships (ORs) between LaB₆ and Al. Three different possible ORs can be predicted between LaB₆ and Al, which are ${\left(100\right)}_{\text{Al}}6{\left(100\right)}_{{\text{LaB}}_{\text{6}}}$, ${\left[001\right]}_{\text{Al}}6{\left[001\right]}_{{\text{LaB}}_{\text{6}}}$; ${\left(110\right)}_{\text{Al}}6{\left(110\right)}_{{\text{LaB}}_{\text{6}}}$, ${\left[001\right]}_{\text{Al}}6{\left[001\right]}_{{\text{LaB}}_{\text{6}}}$; and ${\left(111\right)}_{\text{Al}}6{\left(111\right)}_{{\text{LaB}}_{\text{6}}}$, ${\left[01\overline{1}\right]}_{\text{Al}}6{\left[01\overline{1}\right]}_{{\text{LaB}}_{\text{6}}}$. The prediction results are perfectly confirmed through TEM analysis and prove the nucleation potency of LaB₆. The refining efficacy of Al-2La-1B refiner and its influence on the tensile properties were investigated in the as-cast Al-7Si-0.3Mg alloy. According to the results, LaB₆ has higher nucleation potency than TiB₂, leading to better grain refining efficacy of Al-2La-1B refiner in the as-cast Al-7Si-0.3Mg alloy. Regarding the mechanical performances, tensile properties of the as-cast Al-7Si-0.3Mg casting alloy are prominently improved after addition of Al-2La-1B refiner, due to the refined microstructures.     

Microstructure and textural evolution during cold rolling and annealing of commercially pure titanium sheet

The effects of cold rolling and annealing on the microstructure and textural evolution of a commercially pure titanium (CP-Ti) sheet were investigated. Electron backscatter diffractometry demonstrates that the deformation during rolling is accommodated by twinning and slip. Additionally, twinning is the dominant deformation mechanism when the cold rolling reduction is less than 40%. During rolling, $\left\{11\overline{2}2\right\}〈11\overline{2}\overline{3}〉$ contraction twinning (CT) and $\left\{10\overline{1}2\right\}〈10\overline{1}1〉$ extension twinning (ET) are activated. And, the intensity of the (0002) pole along the ND gradually increases with increasing deformation. During annealing, the fraction of low angle grain boundaries (LAGBs) and the intensity of the (0002) pole along the ND gradually decrease slightly with increasing annealing time, while twinning lamellae disappear rapidly. When the annealing time reaches 60 min, 20% cold-rolled sheet recrystallizes almost completely.     

Atomistic simulations of interactions between screw dislocation and twin boundaries in zirconium

Molecular statics was employed to simulate interaction between screw dislocation and twin boundaries (TB) in hexagonal close-packed zirconium. In the moving TB model, the interaction of a moving $\left\{10\overline{1}2\right\}$ TB with a static $1/3〈11\overline{2}0〉\left\{10\overline{1}0\right\}$ screw dislocation was investigated. Twinning dislocation (TD) nucleation and movement play an important role in the interaction. The screw dislocation passes through the moving TB and changes to a basal one with a wide core. In the moving dislocation model, a moving $1/3〈11\overline{2}0〉\left\{10\overline{1}0\right\}$ dislocation passes through the TB, converting into a basal one containing two partial dislocations and an extremely short stacking fault. If the TB changes to the $\left\{10\overline{1}1\right\}$ one, the moving $1/3〈11\overline{2}0〉\left\{10\overline{1}0\right\}$ prismatic screw dislocation can be absorbed by the static TB and dissociated into two TDs on the TB. Along with the stress–strain relationship, results reveal the complicated mechanisms of interactions between the dislocation and TBs.     

Leaching optimization and dissolution behavior of alkaline anions in bauxite residue

Bauxite residue is a highly alkaline waste containing soluble alkaline anions, which can cause environmental concerns. The optimal leaching conditions, distribution of alkaline anions, types of pivotal alkaline anions and their dissolution behaviors were investigated based on the combination of single factors-orthogonal experiments and leaching stage experiment. Using a two-stage leaching, 86% of the soluble alkaline anions $\left({\text{CO}}_3^{2?},{\text{HCO}}_3^{?},\text{Al}{\left(\text{OH}\right)}_4^{?},{\text{OH}}^{?}\right)$ were leached with a L/S ratio of 2 mL/g, at 30 °C, over 23 h. During the first stage of leaching, approximately 88% of alkaline anions were leached from the dissolution of free alkali (NaOH, carbonate, bicarbonate, NaAl(OH)₄) with the rest originating from the dissolution of alkaline minerals (calcite, cancrinite and hydrogarnet). Supernatant alkalinity was 69.78 mmol/L with ${\text{CO}}_3^{2?}$ accounting for 75%. Furthermore, carbonate leaching was controlled by solid film diffusion using the Stumm Model with an apparent activation energy of 10.24 kJ/mol.     

硅锶复合孕育对含硼灰铸铁组织和性能的影响

用不同配比Si-Sr与Si-Fe复合孕育剂对含硼灰铸铁孕育处理,研究了Si-Sr复合孕育剂对其金相组织、力学性能及冶金质量指标的影响.结果表明:随Si-Sr孕育剂量的增加,含硼灰铸铁的抗拉强度、硬度随之递增.在Si-Sr含量为0.12%时抗拉强度达到峰值,σb=325 MPa;在Si-Sr含量为0.18%时硬度达到峰值,HB=273.此时,石墨主要为A型分布,共晶团细化,硼碳化物呈小块状,均匀分布在珠光体上,珠光体＞95%.当Si-Sr含量为0.12%时,含硼灰铸铁的成熟度RG=1.13,品质系数Qi=1.10,各项冶金质量指标达到最优.