Effect of Gas Atomization Factors on the Characteristics of Rapidly Solidified Al-6Cr-3Fe-2Zr Alloy Powders and Mechanical Properties of the Hot Extruded Alloys
Effect of Gas Atomization Factors on the Characteristics of Rapidly Solidified Al-6Cr-3Fe-2Zr Alloy Powders and Mechanical Properties of the Hot Extruded Alloys
复制标题
气体雾化因素对快凝Al-6Cr-3Fe-2Zr合金粉末特性及热挤压合金力学性能的影响
DOI：
10.2320/jinstmet1952.56.8_923
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发表时间：
1992
影响因子：
--
通讯作者：
Kazuya Takahashi
中科院分区：
文献类型：
--
作者：
Seiichi Koike;Ryuuichi Kubota;M. Ichikawa;T. Baba;Kazuya Takahashi
铝粉的快速凝固是粉末冶金材料生产中最基本的过程。这一过程直接影响到材料的性能和生产成本。本研究采用高−和低−两种不同的气体雾化工艺制备了Al-−-6Cr-3Fe-3Fe-2Zr合金粉末，采用高−和低−压力两种不同的气体雾化工艺，使工业生产更高效，冷却速度更快。此外，还研究了气体雾化因素对As-雾化粒子的颗粒形状、粒度分布、表面氧化和微观结构的影响。研究了这些因素对粉末挤压成形材料力学性能的影响。结果表明，颗粒形状随Al_2O_3表面层的不同而不同，其厚度约为10 nm。在高−压力下雾化氦气使颗粒的平均直径减小到18μm，粒度分布良好。颗粒的微观结构很大程度上取决于所用雾化气体的粒度和类型。使用氦可以得到由Al-−-Cr-−系分散相和Al-−-Cr-−-Fe和Al-−-Zr系−分散相组成的最细小的颗粒组织。−25μm粉末在高压−压力下雾化后形成的挤压合金。表现出优异的室温拉伸强度为584兆帕，室温为300兆帕
The rapid solidification of aluminum powder is the most fundamental process in the production of P／M materials． This process must be clearly understood since it directly affects the properties of materials and their production costs． In this study， A1−6Cr−3Fe−2Zr alloy powder， originally developed as a heat−resistant aluminum alloy， has been produced by using two different gas atomization processes involving high−and low−pressure gas atomization， thus enabling more efficient industrial production of powder with a rapid coo1− ing rate． The effects of gas atomization factors on the particle shape， size distribution， surface oxidation and microstructure of the as−atomized particles have’been investigated． In addition， these effects on the mechani− cal properties of materials formed through powder extrusion have been evaluated． It is found that the particle shape varied with the surface layer of aluminum oxide， which was about 10 nm thick． Atomizing under high−pressure helium reduced the average particle diameter to 18μm with an excellent size distribution． Particle microstructures largely depend on the particle size and type of the atomiz− ing gas used． The use of helium produced the finest particle microstructure made of Al−Cr−Fe and A1−Zr sys− tem dispersoids． The extruded alloy， formed from−25μm powders which were atomized under high− pressure hehum， showed an outstanding tensile strength of 584 MPa at room temperature and 300 MPa at