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Rheo-extrusion of high-strength aluminum alloys using semi-solid slurry made by solidification-rate controlling technique

凝固速率控制半固态浆料流变挤压高强度铝合金

基本信息

批准号：
15560644
负责人：
UETANI Yasuhiro
金额：
$ 1.98万
依托单位：
Toyama Prefectural University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Rheo-extrusion process of high strength 7075 and 2014 aluminum alloys has been tried to develop utilizing their semi-solid slurries made by an easy and unique method, because this process has some great advantages such as saving energies and low lost in contrast to the thixo-extrution process. At first, low ductility (resulted in low strength), which occurs in the materials thixo-extruded at relatively higher speeds and then may also be caused in rheo-extruded ones, could be improved by an adequate forced-air cooling at forward position of die out-let in the thixo-extrusion tests using Al-10%Mg and 7075 alloys. The author used a simple device made of a thin SUS upright tube followed by a certain length of inclined water-cooled tube to make semi-solid slurries of 2014 and 7075 alloys. After many trials, especially in the latter alloy, semi-solid slurries containing solid particles with mean diameter of less than 50μm could be obtained under the condition feeding the melt, which had been cooled to slightly above liquidus temperature by passing down through the upright tube, into the water-cooled tube at forced high pressure. Semi-solid slurries of 7075 and 2014 alloys with various mean diameters of solid particles ranging 110 to 50μm were directly introduced within an extrusion container and then extruded to round bars at given temperatures, extrusion ratios of 25 to 100 and ram speeds of 5 to 20mm/s. They could be extruded soundly at a few times less force and faster by an order of magnitude than those of hot-extrusion. In the usages of 7075 alloy semi-solid slurries containing the finest solid particles, the bars rheo-extruded at 560℃, extrusion ratio of 36 and ram speed of 10mm/s showed the favorable tensile elongation, strength and age-hardenability equivalent to those of hot-extruded one.

高强度7075和2014铝合金的流变挤压工艺是利用简单而独特的方法制成的半固态浆料来开发的，因为该工艺与触变挤压工艺相比具有节能、低损耗等巨大优势。在Al-10%Mg合金和7075合金的触变挤压试验中，首先在模具出口前部进行适当的强制空气冷却，可以改善触变挤压材料在较高速度下的塑性低（导致强度低），然后在流变挤压材料中也会出现这种情况。作者使用了一个简单的装置，由一个薄的SUS立管，然后是一定长度的倾斜的水冷管制成的半固态浆料的2014和7075合金。经过多次试验，特别是后一种合金，当熔体通过立管冷却到略高于液相线温度时，在强制高压下将其送入水冷管，可获得平均粒径小于50μm的半固态浆料。将7075和2014合金的半固态浆料直接引入挤压容器中，然后在给定的温度、挤压比为25 ~ 100和压头速度为5 ~ 20 mm/s的条件下挤压成圆棒。与热挤压相比，它们可以以小几倍的力和快一个数量级的速度被充分挤压。在含有最细固相颗粒的7075合金半固态浆料中，在560℃、挤压比为36、压头速度为10 mm/s的条件下流变挤压棒材，其拉伸延伸率、强度和时效硬化性能与热挤压棒材相当。

项目成果

期刊论文数量（12）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

松田健二, 中村洋平, 木村亜希子, 山田茂, 上谷保裕, 池野進: "SiおよびMnを添加したCu-Zn合金の微視的組織と切削特性"銅と銅合金. 第42巻・1号. 238-242 (2003)

Kenji Matsuda、Yohei Nakamura、Akiko Kimura、Shigeru Yamada、Yasuhiro Kamiya、Susumu Ikeno：“添加 Si 和 Mn 的 Cu-Zn 合金的微观结构和切削性能”铜和铜合金，第 42 卷，第 238 卷。 242（2003）