共查询到19条相似文献,搜索用时 109 毫秒
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镁合金半固态触变注射成形过程中固相形成机制 总被引:1,自引:0,他引:1
触变注射成型是目前唯一用于镁合金工业化生产的半固态成形技术,适合形状复杂、致密度高的零部件的生产。作者主要研究了镁合金触变成型过程中的固相形成机制。触变注射成型过程中主要固相的形成与传统的半固态方法不同,组织中的主要固相不是由螺杆搅拌打碎枝晶形成,而是由未完全熔化的镁合金切屑形成;成型过程中螺杆剪切的主要作用是提供镁合金切屑熔化所需要的热量、混合浆料,并且细化固相;在上述研究基础上,给出了镁合金半固态触变成型过程中固相形态的演变模型。 相似文献
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采用机械搅拌法制备半固态变形镁合金,并设计制造了触变塑性成形装置,进行了变形镁合金触变锻造和常规锻造实验。采用所建立的半固态镁合金本构关系,对触变锻造进行了数值模拟,得到了成形过程中的应力和应变分布,对比了触变锻造和常规锻造的成形特点。结果表明,变形镁合金触变锻造具有变形抗力小、应力分布均匀的特点。通过实验和模拟结果对比可知,两者吻合较好,所获结果可指导变形镁合金触变锻造工艺实践。 相似文献
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目前镁合金主要成形方法有两种--压铸和半固态触变成形法.本文讨论了上述两种方法的基本概念与特征,并包括流变成形,触变铸造和压力成形.此外,作者还提及其发展趋势以及用镁合金废料制作发泡镁合金材料,为镁合金废料回用寻求一种途径. 相似文献
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日本镁合金研究进展及新技术 总被引:19,自引:3,他引:19
吉泽升 《中国有色金属学报》2004,14(12):1977-1984
对日本最新发表的镁合金研究文献、日本金属学会第134次演讲会和塑性加工学会第35次演讲会上演讲者发表的关于镁合金的内容进行整理和综合,全面介绍了日本高性能镁合金材料的制备、镁合金板材棒材、成形性及高温变形特性和镁合金的防燃、防氧化与循环再生等镁合金研究的最新成果,并结合自己的研究实践,对镁合金的发展趋势进行了分析,反映了日本镁合金研究的热点问题和最新进展. 相似文献
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Prior to thixoextrusion, the microstructural evolution of semi-solid AM50A magnesium alloy prepared by the recrystallisation and partial remelting (RAP) route was investigated. The effect of compressive ratio on microstructure of semi-solid AM50A magnesium alloy was studied. Furthermore, tensile properties of thixoextruded components were determined. The results showed that the occurrence of recrystallised grains was closely associated with the location of the first liquid formed above the solidus. With prolonging holding time, deformed microstructure was penetrated, causing fragmentation, which resulted in the decrease of average grain size. Moreover, prolonging holding time was favorable for the improvement of the degree of spheroidization due to the increase in the amount of liquid. With the increase in compressive ratio, the size of solid grain decreased, the degree of spheroidization was improved during partial remelting, and the tensile properties of thixoextruded AM50A components were improved. The tensile properties for AM50A magnesium alloy thixoextruded from starting material produced by the RAP route were better than those of the same alloy produced by die-casting and thixomolding. 相似文献
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Al-6.5%Mg合金的半固态流变铸造及其性能 总被引:1,自引:0,他引:1
利用保温电磁搅拌制备半固态浆料,对Al-6.5%Mg合金的半固态流变铸造进行研究。实验中对该合金的常压铸造、液态压铸和半固态压铸所得铸件的显微组织、力学性能和拉伸断口进行分析比较。结果表明,常压铸造得到的Al-6.5%Mg合金组织为粗大的树枝晶,力学性能较低;与常压铸造相比,液态压铸件的树枝晶生长较为规则,枝晶得到细化,同时,液态压铸件的强度和塑性提高明显;半固态压铸的显微组织则为规则的球状晶,与液态压铸相比,半固态压铸件的强度略有提高,表现出更好的塑性。 相似文献
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基于Pro/E软件的基座压铸模设计 总被引:1,自引:0,他引:1
介绍了锌合金产品基座的模具设计;传统的产品设计和压铸模设计及加工都是根据二维图完成,周期、成本、精度都会受影响。用CAD/CAE/CAM软件Pro/E来实现压铸模设计.可以大大缩短模具设计周期和加工周期,提高模具设计的准确性,大大降低模具设计成本。 相似文献
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Eli Aghion Nir Moscovitch Amir Arnon 《Journal of Materials Engineering and Performance》2009,18(7):912-916
MRI 230D was specially developed to overcome the high-temperature limitations of conventionally die-cast magnesium alloys.
This innovative alloy was primarily developed for the automotive industry, mainly for power-train applications operating under
high-temperature conditions. The present article aims at evaluating the die-casting characteristics of MRI 230D in comparison
with conventional AZ91D Mg alloy. These characteristics are used to evaluate the applicability of this alloy for die-casting
operations which are essential for mass production. 相似文献