Designing High Corrosion Resistant Peritectic Magnesium Alloys via Sc and Y Addition

Metallurgical and Materials Transactions A - With the help of density functional theory (DFT) calculations, Mg-Sc-Y alloys with various Y content were designed and produced. The single-phase...     

稀土在镁合金中的作用与应用研究

介绍了镁与稀土元素的特性及稀土元素对镁合金组织性能的影响。与普通镁合金相比．稀土镁合金经固溶强化热处理后具有更高的物理、化学性能和使用性能．因而具有广阔的应用前景。     

Effect of Ca Addition on the Intensity of the Rare Earth Texture Component in Extruded Magnesium Alloys

Extruded Mg alloys usually display strong basal fiber textures, which are related to poor formability. Inspired by the texture weakening effect of the addition of rare earths (RE) to Mg alloys, two Mg-Ca alloys were designed and a range of extrusion conditions were explored in attempts to reproduce this effect. Constant strain rate and strain rate change compression tests were performed on the specially prepared Mg-0.5Ca and Mg-1Ca alloys. Dynamic strain aging (DSA) was observed to take place in both alloys over a well-defined temperature and strain rate range. Seven extrusion trials were then carried out on the Mg-0.5Ca alloy within and external to the DSA range of conditions. From the resulting textures and microstructures, it is concluded that the 〈11?21〉 (RE) texture component is formed when extrusion is carried out while DSA is taking place. The occurrence of this type of texture weakening is attributed to the promotion of recrystallization within the shear bands formed when the rate sensitivity is negative. The latter in turn arises because of the DSA taking place in the presence of solute Ca.     

镁及镁合金的应用及市场发展前景

镁合金是一种大有发展前景的新型金属材料。本文全面介绍了镁及镁合金在交通运输、航空航天、电子、核能、化工、冶金等工业领域中的应用概况。     

镁合金及其焊接技术

列举了镁合金在各个领域的应用现状,介绍了镁合金焊接的特点,综述了镁合金各种焊接方法的原理、特点及相应的研究现状,并指出了今后镁合金焊接研究的重点。     

Precipitation and Hardening in Magnesium Alloys

Magnesium alloys have received an increasing interest in the past 12?years for potential applications in the automotive, aircraft, aerospace, and electronic industries. Many of these alloys are strong because of solid-state precipitates that are produced by an age-hardening process. Although some strength improvements of existing magnesium alloys have been made and some novel alloys with improved strength have been developed, the strength level that has been achieved so far is still substantially lower than that obtained in counterpart aluminum alloys. Further improvements in the alloy strength require a better understanding of the structure, morphology, orientation of precipitates, effects of precipitate morphology, and orientation on the strengthening and microstructural factors that are important in controlling the nucleation and growth of these precipitates. In this review, precipitation in most precipitation-hardenable magnesium alloys is reviewed, and its relationship with strengthening is examined. It is demonstrated that the precipitation phenomena in these alloys, especially in the very early stage of the precipitation process, are still far from being well understood, and many fundamental issues remain unsolved even after some extensive and concerted efforts made in the past 12 years. The challenges associated with precipitation hardening and age hardening are identified and discussed, and guidelines are outlined for the rational design and development of higher strength, and ultimately ultrahigh strength, magnesium alloys via precipitation hardening.     

镁合金新型绿色产业的发展

绿色制造是现代制造业可持续发展的必由之路，镁合金具有密度小、比强度高和成形性好等特性，符合现代制造业向精密化、轻量化、强韧化方向发展的趋势；镁合金产业的绿色性体现在其环境属性，经济属性等方面，NRC（New-Rheocasting）工艺是一种生产高质量镁合金的新型半固态成形技术，指出镁合金产业的发展必须走绿色制造和无废物加工的道路；建立起节能、环保、高效的镁合金生产体系，形成绿色材料-绿色处理-绿色工序的良性循环。     

镁合金焊接技术的研究现状

镁合金发展前景广阔,但焊接性较差限制了其应用。文章介绍了镁合金的钨极氩弧焊、熔化极惰性气体保护焊、激光焊、搅拌摩擦焊、电子束焊、电阻点焊等常用的几种焊接方法及其研究现状,提出了镁合金焊接今后的研究方向。     

镁基合金的储氢功能

镁及其合金独特的热力学性质可使其用作充电电池的电极材料以及储氢材料,这不仅因为它的价格相对低廉,而且对环境不造成威胁,更重要的是它的优异的储氢功能.该文综述并预测了镁基合金在储氢材料上的应用前景.     

论海绵钛单炉产能与加镁量的关系

研究分析了镁加入量与海绵钛产能的关系 ,实践证明有效利用原反应器空间 ,适当增加镁加入量 ,可以提高单炉海绵钛产能 ,降低海绵钛生产成本 ,且不会对产品质量造成影响     

镁合金的合金化阻燃

介绍了含钙、铈和铍镁合金的阻燃效果、表面氧化膜和阻燃机理的研究现状,指出了现在阻燃镁合金研究方面存在的难点以及今后的研究方向.     

铝及镁合金的半固态成形

半固态加工技术（SSP）起源于20世纪70年代，因其具有许多独特的优点，现已成功地应用于多种有色金属及黑色金属。本文主要介绍铝合金及镁合金半固态成形的基本原理、生产工艺及工业生产概况。     

镁合金的研究进展

介绍了镁合金材料在现代工业发展中的作用、镁合金的开发、加工性能和表面防蚀处理技术，同时对存在的问题进行了探讨和预测。     

铝合金中镁的快速测定

所介绍的铝合金中镁的快速测定,采用DDTC、盐酸羟胺、三乙醇胺联合掩蔽剂掩蔽大量的铝及少量的铜铁锰离子,在PH10以铬黑T为指示剂,用EDTA滴至溶液由紫红色变为纯兰色为终点。方法简单,快速,准确度高,适合于铝合金中镁含量的测定,是一种较好的铝合金中测定镁的方法。     

铝合金-镁合金间搅拌摩擦异质焊接研究现状

综合了近几年铝-镁搅拌摩擦异质焊的研完成果,分析和讨论以下几个方面的内容:(1)铝.镁异质焊的焊接性能及其影响因素;(2)焊接过程中的热输入情况及焊缝处的温度分布;(3)焊缝的力学性能及其影响因素;(4)焊缝的宏观、微观组织及其在局部升温和塑性变形下的演化过程,着重分析了金属间化合物的生成、形貌和分布、及其对焊缝力学性...     

镁及镁合金晶粒细化的研究现状

叙述了镁及镁合金晶粒细化的几种方法，即合金化法、变质处理法、固态变形处理法、半固态成形法、快速凝固法及熔体搅拌法等。细化镁合金晶粒尺寸能显著提高其力学性能．这对推广镁合金的应用具有重要意义。     

镁合金的强韧化研究

从合金化强化、细晶强化及热处理强化等方面,阐述了镁合金的强韧化处理研究的现状及最新进展。同时分析了不同强韧化方法的工艺特点及强化机理,指出目前镁合金强韧化处理中存在的问题和今后强韧化的方向。     

时效处理对变形镁合金延伸率的影响

对ZK60镁合金进行不同工艺的时效处理,分析时效工艺对组织和硬度的影响,同时研究了时效前后的延伸率变化。结果表明：时效处理后,随时效时间的延长和温度的升高,合金组织出现晶粒长大,强化相的扩散,溶解;在120℃,12h处理后,硬度提高43．44％,延伸率达到24．87％。