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Ageing Effect on Hardness and Microstructure of Al-Zn-Mg Alloys 被引量:5
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作者 M.Iqbal, M.A.Shaikh, M.Ahmad and K.A.Shoaib (Nuclear Physics Division, Pakistan Institute of Nuclear Science and Technology P.O.Nilore, Islamabad, Pakistan) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2000年第3期319-322,共4页
Experimental results of the investigation on the hardness of two Al-Zn-Mg alloys [Al-10.0 Zn-4.0 Mg and Al-8.5 Zn-3.0 Mg (wt pct)] aged in the temperature range 60~310℃ for different intervals of time from 1/4 h to ... Experimental results of the investigation on the hardness of two Al-Zn-Mg alloys [Al-10.0 Zn-4.0 Mg and Al-8.5 Zn-3.0 Mg (wt pct)] aged in the temperature range 60~310℃ for different intervals of time from 1/4 h to 168 h are presented. Both the alloys were found to show identical behaviour of hardness with ageing time. Alloy with higher Zn and Mg content had higher hardness than the alloy with lower solute content. There were three ranges of temperature in which different types of precipitates formed and affected the hardness. Some of the grain boundaries were found to migrate and precipitate free zone has been observed. 展开更多
关键词 ZN Ageing Effect on hardness and Microstructure of Al-Zn-Mg Alloys AL
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Effect of Hot Deformation on Microstructure and Hardness of In-situ TiB_2/7075 Composite 被引量:1
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作者 Lin GENG and Jie ZHANG P.O.Box 433, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China C.Bartels and G. Got tstein Institut fur Metallkunde und Metallphysik, Kopernikusstr.14, RWTH Aa 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第6期675-676,共1页
Hardness of the TiB2/7075 composite increased with increasing deformation temperature. In the annealed TiB2/7075 composite, a great amount of fiber-like MgZn2 phases (about 1 mum in length) and small MgZn2 phases (abo... Hardness of the TiB2/7075 composite increased with increasing deformation temperature. In the annealed TiB2/7075 composite, a great amount of fiber-like MgZn2 phases (about 1 mum in length) and small MgZn2 phases (about 100 nm in size) were precipitated nearby the grain boundaries where the TiB2 particles exist. After deformation at 300 degreesC, some of the large precipitates and all the small precipitates in these area dissolved into the matrix, meanwhile, fine precipitates were formed in grains. After deformation at 450 degreesC, all the precipitates in the annealed composite dissolved into the matrix, and new phases were precipitated in grains. The dissolution of the large fiber-like precipitate makes the saturation level of the matrix increased and leads to an increased solution hardening and natural aging, which contribute much to the hardening effect. 展开更多
关键词 TIB Effect of Hot Deformation on Microstructure and hardness of In-situ TiB2/7075 Composite
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Nitriding of Hard Fe Electrodepositionand Its Effects on Wear Resistance 被引量:5
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作者 Chenghui GAO, Dajian CHEN and Baiyang ZHOU Department of Mechanical Engineering, Fuzhou University, Fujian, Fuzhou 350002, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第2期271-274,共4页
Nitriding is employed for the hard Fe electrodeposition to produce a hard-facing and antiwear coating. It only takes 1 h for the hard Fe coating, which is much shorter than nitriding the Fe and steel. The results show... Nitriding is employed for the hard Fe electrodeposition to produce a hard-facing and antiwear coating. It only takes 1 h for the hard Fe coating, which is much shorter than nitriding the Fe and steel. The results showed that the nitriding can increase the microhardness, wear resistance of the coating, as well as the bonding strength of the coating with the substrate. Additionally it can eliminate the brittleness, turn the internal stress of the coating from tension to compression. The wear resistance of the nitrided Fe coating is 4.6 times as high as that of Cr coating. It is simple and economic to combine hard Fe electroplating and nitriding, which is a good technology of the tribological surface modification. 展开更多
关键词 FE Nitriding of Hard Fe Electrodepositionand Its Effects on Wear Resistance
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Use of Agro wells for small scale irrigation and their effects on groundwater system in a hard rock aquifer:a case study in Kalaoya basin,SriLanka
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《Global Geology》 1998年第1期52-52,共1页
关键词 rock Use of Agro wells for small scale irrigation and their effects on groundwater system in a hard rock aquifer case
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