The excellent performance of aluminum-based composites shown in automotive field is analyzed. In the paper the performance, latest development and application is reviewed of aluminum-based composites as automotive part material. The future development of aluminum-based composites is pointed out.

The latest development of in-situ non-destructive testing is reviewed of phase change and particle pulverization of hydrogen storage alloys during hydrogen absorption and desorption. It is pointed out that X-ray diffraction,nuclear magnetic resonance and neutron diffraction are used mainly for monitoring phase structure of the alloy in situ,while acoustic emission and X-ray computed tomography can be used mainly for quantitatively monitoring pulverization process of alloy particles in situ.

2012年中国钨行业走势不尽如人意，市场供需失衡，制约了整个钨行业的发展。近年来钨原材料的价格居高不下，部分企业缺乏良好的原料采购策略，采购时机无法准确把握，给企业的长期发展带来了不利影响。

《硬质合金》为国家出版基金项目“有色金属理论与技术前沿丛书”之一。该项目由国家设立，用于鼓励和支持优秀公益性出版项目，代表我国学术出版的最高水平。

2013年国际（深圳）稀土材料及应用产业展览会——深圳稀土展，将于6月26～28日在深圳会展中心举办。展会旨在在中国乃至全球最大的稀土应用中心，汇集国内外一流稀土产业供应商，提供与用户、买家直接面对面洽谈、交流的平台，帮助企业了解市场需求，宣传品牌形象。

Abstract：Impacts of morphology and microstructure of yellow tungsten on properties of nanometer WC powders were studied. Two kinds of nanometer W powders were obtained respectively by hydrogen reduc-tion of pretreated fine-grained yellow tungsten and normal yellow tungsten in a tube furnace at 560-760 ℃. After mixed with carbon black powders,both the two kinds of W powders were carbonized at 1 180 ℃ to prepare nanometer WC powders. Ultrafine-grained WC-Co sintered bodies were obtained by mixing, pressing and sintering of WC powders. And then the properties of nanometer WC powders and WC-Co sin- tered bodies were characterized. The results show that nanometer W powders of loose microstructure and good dispersion can be obtained more easily with fine-grained yellow tungsten of loose porous microstruc-ture. The obtained nanometer WC powders are more uniform,and the corresponding ultrafine-grained WC -Co sintered body has uniform microstructure and excellent performance.

The effects of cyclic heat treatment were investigated on the mechanical properties of the tung-sten heavy alloy 90W-TNi-3Fe. The results show that both the tensile strength and impact toughness of the alloy sample are improved significantly by cyclic heat treatment, while its elongation is reduced. The frac- ture of the alloy is observed by SEM,and then the influencing mechanism of cyclic heat treatment on alloy mechanical properties in argon atmosphere is discussed.

The adsorption experiments were conducted of ammonia-nitrogen wastewater from rare earth smelter,with nature clinoptilolites in Henan Gongyi and Zhejiang Jinyun. The influences of various process conditions on ammonia-nitrogen removal rate were investigated. The results show that natural clinophilo-lites have good effects of ammonia-nitrogen removal from the wastewater. For 200 mL wastewater with ammonia-nitrogen concentration of 61 mg/L,the ammonia-nitrogen removal rate can be over 92% and its concentration is 4.88 mg/L in the treated wastewater under the conditions of Jinyun zeolite dosage 11.0 g and its particle size ≤0. 106 mm,pH=7.8,reaction temperature 45 ℃ ,and reaction time 0.5 h.

Working principles and characteristics of water jet cutting are introduced as well as its technical parameters and performance in titanium cutting. The differences of water jet cutting and plasma cutting are compared in titanium cutting. The influences of cutting methods on chemical composition, mechanical prop-erties and machinahility of titanium are analyzed to provide a reference for popularization and application of water jet cutting technology.

A tellurium recovery process from refractory tellurium-containing tailings was studied. The feasi-bility was discussed of tellurium recovery by the integrated process flowsheet of flotation, gravity separa- tion and magnetic separation. The results show that two types of concentrate from flotation and gravityseparation are obtained by one-stage grinding and flotation of raw tailings, gravity separation of flotation tailings, and magnetic separation of gravity-separation concentrate. The average tellurium grade of themixed concentrate is 1.65% ,and its total recovery is up to 45.97%. And the concentrate product can be used as metallurgical raw materials for further tellurium extraction.