A Physical Approach to Grain Refinement of Wrought Mg Alloys via Solidification Control
通过凝固控制细化变形镁合金晶粒的物理方法
基本信息
- 批准号:EP/E00119X/1
- 负责人:
- 金额:$ 41.36万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2006
- 资助国家:英国
- 起止时间:2006 至 无数据
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Human society is highly dependent on the Earth's climate, as climate patterns largely determine whether we will have enough food and fresh water. The gradual increase in the global temperature, due primarily to the increased amount of an undesirable gas, CO2, in the atmosphere, can cause significant climate changes. Road transport activities account for about 24% of the total man-made CO2 released to the atmosphere, and passenger cars are responsible for about 60% of these emissions. It is therefore an important issue to reduce the CO2 emissions from passenger cars in order to prevent the Earth's climate from deteriorating. One of the most efficient and easiest ways to do this, is to reduce the weight of a car so that the car will burn less petrol or diesel. Magnesium is a very light metal, in fact, some magnesium materials can be made lighter than water. On the other hand, they are still strong enough for making most of the parts used in a car. Therefore, they are very attractive to car manufacturers.Just like a sand castle that is made of many grains of sand, magnesium materials are composed of many small grains as well. The grain size in a magnesium material plays a very important role in determining whether the material is ductile or not. In general, the smaller the grain size, the more ductile the magnesium material will be. It is thus highly beneficial for magnesium materials to have a very small grain size, so that we can readily manufacture them into different shapes, such as sheet, tubes, bars, rods, etc. These forms of magnesium products are all very useful for making car parts and parts used in toys, bicycles, computers, mobile phones, televisions, etc. Unfortunately, large, thick magnesium materials normally have a coarse grain size, as a result, they are not ductile enough. Therefore, one has to use a very slow manufacturing process to make magnesium sheet, tubes, bars, rods, etc. This makes them very expensive and not many customers including most car manufacturers, are willing to use them in a large quantity. It is therefore crucial to reduce their grain size. Similar to the process of water becoming ice, solid magnesium materials start off as liquid magnesium. The change from liquid to solid is called solidification, which determines the grain size of a magnesium material. By effectively controlling the solidification process one can obtain a very fine grain size. In the past 65 years, there have been many efforts towards controlling the solidification process of magnesium materials. Although there have been some positive developments, the resultant grain size is still not small enough. In this programme, we propose a unique approach, designated 'twin-screw melt shearing'; it can effectively control the solidification of a magnesium material. The key point of this approach is to ensure that as many small grains as possible survive in the liquid during solidification. This is done by rapidly lowering the bulk liquid temperature to below a critical value; in doing so, the process will give a very fine and uniform grain size. Preliminary experiments have given very encouraging and exciting results, suggesting that the concept is feasible. Therefore it is hoped that further study into this new solidification control process will develop a hugely beneficial processing system, which will be able to deliver a fine grain size in large, thick magnesium products. It is further anticipated that the new technology will also be applicable to the solidification of other materials, such as aluminium and titanium.The anticipated results from this study will be both environmentally and economically beneficial to the global community.
人类社会高度依赖地球的气候,因为气候模式在很大程度上决定了我们是否会有足够的食物和淡水。全球气温的逐渐升高,主要是由于大气中有害气体二氧化碳的增加,可引起重大的气候变化。道路运输活动约占人为排放到大气中的二氧化碳总量的24%,而乘用车约占这些排放量的60%。因此,为了防止地球气候恶化,减少乘用车的二氧化碳排放是一个重要的问题。要做到这一点,最有效和最简单的方法之一就是减轻汽车的重量,这样汽车就会消耗更少的汽油或柴油。镁是一种非常轻的金属,事实上,一些含镁材料可以制成比水还轻的材料。另一方面,它们仍然足够坚固,可以制造汽车中使用的大部分部件。因此,它们对汽车制造商非常有吸引力。就像一座由许多沙粒组成的沙堡一样,镁材料也是由许多小颗粒组成的。镁材料的晶粒尺寸对材料的延展性起着非常重要的作用。一般来说,晶粒尺寸越小,镁材料的延展性越好。因此,镁材料具有非常小的晶粒尺寸是非常有益的,这样我们就可以很容易地将它们制造成不同的形状,如片状、管状、棒状、棒状等。这些形式的镁产品在制造汽车零件和玩具、自行车、电脑、手机、电视等零件时都非常有用。不幸的是,大而厚的镁材料通常具有粗糙的晶粒尺寸,因此,它们的延展性不够。因此,人们必须使用非常缓慢的制造过程来制造镁片,管,棒,棒等。这使得它们非常昂贵,没有多少客户,包括大多数汽车制造商,愿意大量使用它们。因此,减小晶粒尺寸是至关重要的。与水变成冰的过程类似,固体镁材料最初也是液态镁。从液体到固体的转变称为凝固,它决定了镁材料的晶粒尺寸。通过有效地控制凝固过程,可以获得非常细的晶粒尺寸。在过去的65年中,人们在控制镁材料凝固过程方面做了许多努力。虽然有一些积极的进展,但最终的晶粒尺寸仍然不够小。在这个项目中,我们提出了一种独特的方法,称为“双螺杆熔体剪切”;它能有效地控制镁材料的凝固。这种方法的关键是确保在凝固过程中尽可能多的小晶粒在液体中存活。这是通过迅速降低散装液体温度至临界值以下来实现的;在这样做的过程中,将得到一个非常细和均匀的晶粒尺寸。初步实验已经给出了非常鼓舞人心和令人兴奋的结果,表明这个概念是可行的。因此,希望对这种新的凝固控制工艺的进一步研究将开发出一种非常有益的加工系统,它将能够在大而厚的镁产品中提供细晶粒尺寸。进一步预计,新技术也将适用于其他材料的凝固,如铝和钛。这项研究的预期结果将对全球社会在环境和经济上都有利。
项目成果
期刊论文数量(4)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
High-intensity ultrasonic grain refinement of magnesium alloys: role of solute
- DOI:10.1179/136404609x367894
- 发表时间:2009-08
- 期刊:
- 影响因子:1.4
- 作者:A. Ramirez;M. Qian;B. Davis;T. Wilks
- 通讯作者:A. Ramirez;M. Qian;B. Davis;T. Wilks
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Nick Bennett其他文献
Hierarchically nanostructured thermoelectric materials: challenges and opportunities for improved power factors
- DOI:
10.1140/epjb/e2020-10455-0 - 发表时间:
2020-11-23 - 期刊:
- 影响因子:1.700
- 作者:
Neophytos Neophytou;Vassilios Vargiamidis;Samuel Foster;Patrizio Graziosi;Laura de Sousa Oliveira;Dhritiman Chakraborty;Zhen Li;Mischa Thesberg;Hans Kosina;Nick Bennett;Giovanni Pennelli;Dario Narducci - 通讯作者:
Dario Narducci
Nick Bennett的其他文献
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{{ truncateString('Nick Bennett', 18)}}的其他基金
Vacancy-Rich Silicon as a Flexible Thermoelectric Material
富空位硅作为柔性热电材料
- 批准号:
EP/N03516X/1 - 财政年份:2016
- 资助金额:
$ 41.36万 - 项目类别:
Research Grant
Industrial CASE Account - Portsmouth 2008
工业 CASE 帐户 - 朴茨茅斯 2008 年
- 批准号:
EP/G501688/1 - 财政年份:2009
- 资助金额:
$ 41.36万 - 项目类别:
Training Grant
A Physical Approach to Grain Refinement of Wrought Mg Alloys via Solidification Control
通过凝固控制细化变形镁合金晶粒的物理方法
- 批准号:
EP/E00119X/2 - 财政年份:2007
- 资助金额:
$ 41.36万 - 项目类别:
Research Grant
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