共查询到20条相似文献，搜索用时 328 毫秒
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1 Ｉｎｔｒｏｄｕｃｔｉｏｎ Ｆｅ3Ａｌｂａｓｅｄａｌｌｏｙｓｅｘｈｉｂｉｔｈｉｇｈｏｘｉｄａｔｉｏｎｒｅｓｉｓｔａｎｃｅ ,ｅｘｃｅｌｌｅｎｔｓｕｌｐｈｉｄａｔｉｏｎｒｅｓｉｓｔａｎｃｅａｎｄｌｏｗｃｏｓｔｏｆａｌｌｏｙｃｏｎｓｔｉｔｕｅｎｔｓ.Ｈｏｗｅｖｅｒ ,ｔｈｅｓｅａｌｌｏｙｓｈａｖｅｎｏｔ ｙｅｔｆｏｕｎｄｗｉｄｅｓｐｒｅａｄａｐｐｌｉｃａｔｉｏｎｆｏｒｔｈｅｉｒｅｎｖｉｒｏｎｍｅｎｔａｌｅｍｂｒｉｔｔｌｅｍｅｎｔ[1～ 3] .Ｔｈｅｔｅｎｓｉｌｅｐｒｏｐｅｒｔｉｅｓａｎｄｅｎｖｉ ｒｏｎｍｅｎｔ… 相似文献
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The room temperature tensile properties of cold-rolled and annealed Fe3(Al,Cr,Zr) alloy are similar to those of warm-rolled Fe3Al alloys. The cold-rolled Fe3(Al,Cr,Zr) alloy is also susceptible to test environments. It has been shown that the ductility in various environments decreases
in sequence of oxygen-oil-air-distilled water. The results of X-ray diffraction analysis show that (211) preferred orientation
of B2 phase appears in cold-rolled Fe3(Al,Cr,Zr) alloy after recrystallization annealing.
Supported by the National Natural Science Foundation of China (59895157) and the Natural Science Foundation of Shanghai Municipal
Commission of Science and Technology (98ZE14020) 相似文献
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本文探讨了固溶热处理和挤压工艺对于AZ31镁合金强韧化的影响。AZ31镁合金经过固溶热处理后,微观组织观测表明晶粒明显细化,平均尺寸从250μm减小为25μm,配合挤压成型AZ31镁合金的力学性能有显著提高。 相似文献
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大规格20CrMnTi棒材锻造之后,采用金相显微镜组织分析发现,表层组织不匀,表层晶粒尺寸相差悬殊,细晶粒中伴有粗大的珠光体团,局部混晶严重,为改善表层组织不均匀性,分别经多次正火及等温退火热处理,实验证实,多次正火可以消除局部混晶,并且细化组织;等温退火,也可以消除局部混晶,但偏析带仍较明显;比较而言,多次正火是锻造后较好的热处理工艺。 相似文献
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镁合金板材塑性成形加热系统设计 总被引：1，自引：1，他引：0
镁合金在常温下不容易进行塑性变形,一般变形温度必须在150℃以上。为了方便在一般万能试验机上开展镁合金板材力学性能实验研究,本文设计了适用于镁合金拉伸和拉深试验的智能型加热系统,并利用该加热系统进行了镁合金板材拉伸实验,取得了满意的效果。 相似文献
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瞿学良 《江苏广播电视大学学报》2001,12(6):50-52
杂质元素、净化、晶粒细化，变质处理和热处理等工艺因素对铸造Al-Si-Mg合金机械性能会产生一定的影响，提高这类合金机械性能的途径有控制杂质元素，对合金液进行有效的净化，采用合理的合金化和热处理。 相似文献
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段红萍 《西安文理学院学报》2014,(4):40-43
旋转磁场的搅拌作用能抑制枝晶的生长,增加游离晶的数量,因此共晶Al-Si合金宏观组织的晶粒呈明显细化趋势,且晶粒尺寸也随着磁场强度的增加而变得均匀化.磁场冲刷产生的大量游离晶核来不及完全重熔,变成等轴晶的晶核,有利于等轴晶的生长,所以随着磁场强度的增加,共晶Al-Si合金柱状晶区宽度减少,等轴晶区宽度增大.旋转磁场使柱状晶迎流侧和背流侧的过冷度不同,使其生长方向发生偏转,转向迎流方向生长,且随磁场强度的增大,柱状晶偏转的角度增大. 相似文献
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贺雪莹 《南阳师范学院学报》2009,8(6):54-57
实验研究了不同固溶热处理温度对Al-Zn9.2-Mg2.4-Cu1.8超高强铝合金的组织性能的影响,并结合微观组织观察进行了分析.结果表明:低温长时和高温短时相结合的均匀化,使合金组织的均匀化程度更高,为同步提高合金的强度和韧度提供了可靠的保障.对合金的热处理方案进行适当的调整,使合金获得较好的综合性能,优化了晶粒尺寸;复合固溶新工艺可以大幅度增加合金固溶度,提高合金的过烧温度;复合固溶和双峰时效相结合可以提高合金的强度. 相似文献
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We deformed AZ31 magnesium alloys by cold forging and cold compression process, and investigated their static recrystallization kinetics during the annealing process. The results demonstrate that the relationship between the annealing time and the fraction of recrystal grains can be described by the Johnson-Mehl-Avrami-Kolmogorov （JMAK） equation. Based on the kinetics analysis, we calculated that the activation energy of recrystallization by cold forging and cold compression were about 53.5 kJ/mol and 85.0 kJ/mol, respectively. The activation energy of cold compression process was higher than that of the cold forging process because the latter had high-rate deformation, which caused more energy storage during deformation. 相似文献
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以AZ31B镁合金为研究对象,采用光学显微镜分析测试手段,对变形镁合金AZ31B的TIG交流平板对接焊接头进行了微观组织观察,结果发现在熔焊条件下AZ31B镁合金焊缝附近的纤维组织消失,在焊缝区出现了细晶粒,而热影响区(HAZ)的晶粒明显粗大。 相似文献
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采用搅拌摩擦焊技术对6061-T5铝合金进行焊接,分析了焊接速度对接头成形、微观结构及力学性能的影响.结果表明:随着焊接速度的增加,沉淀相固溶度下降,晶粒细化;焊接速度过大时,热输入不足,呈现原始态组织.当转速为800 r/min,焊接速度为60 mm/min时,接头成形良好,抗拉强度达到最大值.采用合适的搅拌摩擦焊工艺参数,6061-T5铝合金能实现可靠的连接. 相似文献
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为了揭示HPS485wf钢动态再结晶组织演变行为,在不同的单道次热压缩变形条件下,进行了该钢动态再结晶过程的CA仿真．结果表明：随着变形温度升高,动态再结晶的孕育期缩短、速度加快,平均晶粒尺寸增加;随着应变速率加快,动态再结晶的孕育期延长、速度减慢,平均晶粒尺寸减小． 相似文献
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在应变速率为10-3～10-1S-1、温度为150℃～400℃的条件下,在万能试验机上对AZ91D镁合金板材进行了在线加热拉伸试验,获得了各成形条件下0°、45°、90°三个方向的应力应变曲线。试验结果表明,当拉伸温度增加或拉伸速率降低时,板料的屈服强度和抗拉强度降低,而其塑性变形能力提高;板材具有明显的各向异性,45°方向塑性变形能力最高,90°方向时最低。 相似文献
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通过对不同热处理和时效处理工艺的Mn-Cu合金的X射线分析、微观组织分析和阻尼性能测试,分析了热处理冷却方式、时效处理时间对合金组织和阻尼性能的影响。研究表明,时效处理不会产生新相,随着时效处理时间的增加,晶粒尺寸增大,阻尼性能提高,但超过一定时间,阻尼性能反而降低,其中时效处理8 h能够获得最佳的阻尼性能。 相似文献
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张煜 《深圳职业技术学院学报》2010,9(5):64-68
利用织构定量检测方法考察预备退火温度和最终退火温度对成品高压铝箔再结晶立方织构含量的影响．结果表明：在350℃×2h预备退火条件下,成品箔材中再结晶立方织构取向密度最大,R织构比例最小．其作用机理是预备退火影响铁的存在状态,进而影响成品退火时的原位再结晶和不连续再结晶过程．随着最终退火温度的增加,铝箔立方织构含量也增加．升高退火温度使析出物溶解加速,减弱对晶界作用,从而使晶界运动加快,有利立方织构的发展． 相似文献
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添加稀土元素Sc,可以显著提高镁合金的力学性能,特别是高温力学性能,通过余氏固体与分子经验价电子结构理论（EET）对Mg-Sc合金进行了价电子结构计算及分析,计算结果显示纯金属晶体Mg处于原子杂化态第三阶,Sc处于原子杂化态第五阶,Sc在镁基体中强化键能,有较强的固溶强化作用,Mg—Sc相可显著提高Mg合金的强度和高温抗蠕变性能,有效细化镁晶粒。 相似文献
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An Mg-Zn-Mn-Ca alloy with high Zn content was fabricated by vacuum melting. The as-cast microstructure was investigated using XRD, SEM and EDS. It was shown that the alloy was composed of α-Mg, strip-like Ca2Mg6Zn3 and a few Mn- containing phases. Most of the Ca2Mg6Zn3 phase was distributed at grain boundaries while Mn-containing particles were deposited within grains. The as-cast samples were immersed in a Hank＇s balanced salt solution （HBSS） up to 24 h. The corroded surface morphology and cross-section microstructure were analyzed after different time of immersion so as to understand the corrosion behavior of the alloy. During immersion in the HBSS, the alloy corroded homogeneously at the very beginning and then localized corrosion occurred. The secondary phases protruded on the surface due to the dissolution of α-Mg, suggesting micro- galvanic corrosion occurred with secondary phases acting as the cathode and ct-Mg as the anode. Micro-cracks were formed at the interfaces between Ca2Mg6Zn3 and α-Mg, indicating an undermining tendency of the secondary phases. 相似文献
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Microstructure Refinement of Sn-Sb Peritectic Alloy under High-Intensity Ultrasound Treatment 总被引：2，自引：0，他引：2
In this paper the solidification behavior of Sn-Sb peritectic alloy and the mechanism of grain refinement in solidification process under high-intensity ultrasonic field are investigated. Three different powers of high-intensity ultrasound are introduced into molten Sn-Sb peritectic alloy to study the refining effectiveness. The results show that the application of high-intensity ultrasound during solidification process of Sn-Sb peritectic alloy can refine a phase and β phase and eliminate gravity segregation of the alloy. As acoustic intensity is increased from 400 W to 800 W, not only the homogenous fine structure can be obtained, but also the cubic β phase crystals tend to be spherical. Microstructure of the sample treated by 600 W high-intensity ultrasound demonstrates the best refining effect. 相似文献
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In this paper the solidification behavior of Sn-Sb peritectic alloy and the mechanism of grain refinement in solidification process under high-intensity ultrasonic field are investigated. Three different powers of high-intensity ultrasound are introduced into molten Sn-Sb peritectic alloy to study the refining effectiveness. The results show that the application of high-intensity ultrasound during solidification process of Sn-Sb peritectic alloy can refine α phase and β phase and eliminate gravity segregation of the alloy. As acoustic intensity is increased from 400 W to 800 W, not only the homogenous fine structure can be obtained, but also the cubic β phase crystals tend to be spherical. Microstructure of the sample treated by 600 W high-intensity ultrasound demonstrates the best refining effect. 相似文献