溅射微晶CoCrAl涂层的抗循环氧化性能SCIEI

用溅射方法获得了晶粒尺寸小于 0.5μm的微晶Co-30Cr-5Al涂层,并对正常晶粒的CoCrAl合金及其微晶溅射层的1000℃抗循环氧化性能进行了研究。用扫描电镜和声发射技术研究了微晶化对CoCrAl合金表面氧化膜粘附性的影响。结果表明:正常晶粒的 CoCrAl合金经1次循环氧化,初生氧化膜即出现剥落,继而表面生成了氧化铬,而氧化铬的保护性远比氧化铝差;而微晶 CoCrAl涂层经100次循环,表面氧化铝膜仍完好无损。声发射测量结果表明,微晶涂层比正常晶粒的合金具有更高的抗表面氧化膜剥落的能力。     

溅射沉积CoCrAl微晶涂层的抗氧化性能及抗氧化机理

用磁控溅射技术获得了晶粒尺寸小于100nm的Co—30Cr—5Al微晶涂层。对同成分CoCrAl合金及其微晶涂层进行1100℃恒温和1000℃循环氧化试验,并与CoCrAlY合金进行比较。用声发射技术、划痕法及透射电镜对溅射CoCrAl微晶涂层的抗氧化机理进行了研究。结果表明微晶化提高了CoCrAl合金表面氧化膜的粘附性,从而大大改善了合金的抗恒温与循环氧化性能。而微晶化提高氧化膜粘附性的原因是:(1)微晶表面氧化膜比铸态合金表面氧化膜的晶粒细得多,细晶氧化膜可通过扩散蠕变释放生长应力和部分热应力;(2)     

LDZ125微晶涂层抗循环氧化性能

研究了高温合金LDZ125及其溅射微晶涂层的抗循环氧化行为.微晶涂层仅由γ相组成,晶粒尺寸约为30nm.结果表明:微晶涂层在1000℃的抗循环氧化性能比铸态合金的有极大提高.微晶层氧化时只形成单一的Al2O3氧化膜,且在整个氧化过程中未见开裂剥落,有极好的粘附性.     

K17F高温合金溅射微晶层的抗循环氧化行为

用溅射方法获得了晶粒尺寸小于０．１μｍ的高温合金Ｋ１７Ｆ的微晶涂层，对铸态高温合金Ｋ１７Ｆ及其溅射微晶层的循环氧化行为进行了研究，结果表明，微晶层中含γ相，不含γ和碳化物相，为匀相组织。它在１０００℃的抗循环氧化性能较铸态合金有极大提高，溅射微晶层具有优异的防护性和粘附性，在冷却过程中不会开裂，即使在１００次循环氧化后仍未见剥落。     

磁控溅射Ni_3(AlCr)微晶涂层的抗氧化性能

研究了铸态Ni3(AlCr)合金及其微晶溅射涂层在900—1000℃下的高温氧化性能,结果表明:铸态Ni3(AlCr)合金在氧化过程中,开始形成以Al2O3为主含有少量NiAl2O4的氧化膜,但氧化膜的粘附性很差,在冷却时很容易剥落,在继续氧化过程中合金表面将形成NiO膜,由于NiO的保护性较差,合金表现出“失稳氧化”行为。而溅射微晶Ni3(AlCr)涂层表面形成的氧化膜与基体粘附良好,冷却过程中未发生剥落。长时间氧化后表面氧化膜只由Al2O3和NiAl2O4组成,未出现NiO,因此溅射微晶化合金的抗氧化     

K17F高温合金溅射微晶层的抗高温氧化行为

研究了铸态高温合金Ｋｌ７Ｆ及其溅射微晶（小于０．ｌμｍ）层的高温氧化行为．结果表明，微晶层为均匀的γ相组织，它大幅度提高铸态合金的９００至１０００℃的抗氧化性能，甚至比渗Ａｌ涂层还好在高温下，Ｋ１７Ｆ生成以Ａｌ２Ｏ３为主，含有Ｎｉ，Ｃｒ，Ｔｉ氧化物的氧化膜，它在氧化过程中易剥落，而溅射微晶层表面只生成单一的α－Ａｌ２Ｏ３膜，具有优异的防护性和粘附性，在５００ｈ的氧化过程中未见剥落．     

溅射纳米晶Ni20Cr涂层的高温氧化行为

利用溅射法在Ni20Cr合金表面制备相同成分的纳米晶涂层,研究了该合金与纳米晶涂层在空气中1000℃的恒温氧化和抗循环氧化行为.结果表明,纳米晶涂层恒温氧化时生成单层连续氧化膜,氧化产物以Cr2O3为主,有少量的NiCr2O4存在.经1000℃循环氧化,纳米晶涂层生成的氧化物致密且颗粒细小,氧化膜相对较完整.溅射纳米晶...     

空心阴极电弧镀NiCrAlY涂层的抗氧化性能

采用空心阴极电弧离子镀技术制备NiCrAlY涂层,研究涂层的高温抗氧化性能。结果表明涂层组织致密,与合金结合状态良好。电弧离子镀NiCrAlY涂层在1 100℃恒温氧化100h后增重只有2.22mg/cm2,在100次循环氧化后仍没有失重现象,其抗恒温氧化和抗循环氧化性能远优于成分相近的超音速火焰喷涂、爆炸喷涂和大气等离子喷涂的NiCrAlY涂层。电弧离子镀NiCrAlY涂层在恒温氧化和循环氧化过程中表面均形成了连续致密、粘附性的氧化铝保护膜。氧化膜没有翘起和剥落现象,涂层组织在氧化后仍然完整致密。热喷涂NiCrAlY涂层在上述氧化过程中则生成了保护性较差的Ni、Cr和Al混合氧化物,并发生了氧化膜剥落,同时有严重的内氧化现象。     

NiAl涂层对NiAl-Cr(Zr)共晶合金1100℃空气中循环氧化行为的影响

研究了溅射NiAl涂层对NiAl-Cr(Zr)共晶合金在1100 ℃空气中抗氧化性能的影响.结果表明,在1100 ℃高温下,NiAl-Cr(Zr)共晶合金由于形成Al2O3 + Cr2O3+ ZrO2的混合氧化物膜而表现出较差的抗循环氧化性能.在其表面溅射与其成分接近的NiAl 微晶涂层,高温下形成致密的、粘附性好的A...     

K17F高温合金溅射微晶层的抗高温氧化行为

研究了铸态高温合金Ｋ１７Ｆ及其溅射微晶（小于０．１μｍ）层的高温氧化行为。结果表明，微晶层均匀的γ相组织，它大幅度提高铸态合金的９００至１０００℃的抗氧化性能，甚至比渗Ａｌ涂层还好，在高温下，Ｋ１７Ｆ生成以Ａｌ２Ｏ３主为，含有Ｎｉ，Ｃｒ，Ｔｉ氧化物的氧化膜，它在氧化过程中易剥落，而溅射微晶层表面只生成单一的α－Ａｌ２Ｏ３膜，具有优异的防护性和粘附性，在５００ｈ的氧化过程中未见剥落。     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.     

Rheology Feature of Simple Metal Melt

The rheology feature of Sb, Bi melt and alloys was studied using coaxial cylinder high-temperature viscometer. The results showed that the curve of torsion-rotational speed for Sb melt presents a linear relation in all measured temperature ranges, whereas for the Bi melt, the curve presents obvious non-Newtonian feature within the low temperature range and at relative high shear stress. The rheology feature of Sb80Bi20 and Sb20Bi80 alloy melts was well correlated with that of Sb and Bi, respectively. It is considered that the rheology behavior of Sb melt plays a crucial role in Sb80Bi20 alloy and that of Bi melt plays a crucial role in Sb20Bi80 alloy.