加州大学科学家发明超强度轻量级金属-凯发k8官网

加州大学科学家发明超强度轻量级金属
文章来源:未知 文章作者:enread 发布时间:2015-12-25 06:00 字体: [ ] 
(单词翻译:双击或拖选)
a team led by researchers from the ucla henry samueli school of engineering and 1 science has created a super-strong yet light 2 metal with extremely high specific strength and modulus, or stiffness-to-weight ratio. the new metal is composed of 3 infused with a 4 and even dispersal of 5 6 carbide nanoparticles. it could be used to make 7 airplanes, spacecraft, and cars, 8 to improve fuel efficiency, as well as in mobile electronics and biomedical devices. to create the super-strong but lightweight metal, the team found a new way to 9 and 10 nanoparticles in molten metals. they also developed a scalable manufacturing method that could pave the way for more high-performance lightweight metals. the research was published today in nature. 
 
"it's been proposed that nanoparticles could really enhance the strength of metals without damaging their plasticity, especially light metals like magnesium, but no groups have been able to disperse ceramic nanoparticles in molten metals until now," said xiaochun li, the principal 11 on the research and raytheon chair in manufacturing engineering at ucla. "with an 12 of physics and materials processing, our method paves a new way to enhance the performance of many different kinds of metals by evenly infusing dense nanoparticles to enhance the performance of metals to meet energy and sustainability challenges in today's society." 
 
structural metals are load-bearing metals; they are used in buildings and vehicles. magnesium, at just two-thirds the 13 of 14, is the lightest structural metal. silicon carbide is an ultra-hard ceramic commonly used in industrial cutting blades. the researchers' technique of infusing a large number of silicon carbide particles smaller than 100 nanometers into magnesium added significant strength, stiffness, plasticity and 15 under high temperatures.
 
the researchers' new silicon carbide-infused magnesium demonstrated record levels of specific strength -- how much weight a material can withstand before breaking -- and specific modulus -- the material's stiffness-to-weight ratio. it also showed superior stability at high temperatures.
 
ceramic particles have long been considered as a potential way to make metals stronger. however, with microscale ceramic particles, the infusion process results in a loss of plasticity.
 
nanoscale particles, by contrast, can enhance strength while maintaining or even improving metals' plasticity. but nanoscale ceramic particles tend to 16 together rather than 17 evenly, due to the tendency of small particles to attract one other.


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1 tz2zxa     
adj.应用的;v.应用,适用
参考例句:
  • she plans to take a course in applied linguistics.她打算学习应用语言学课程。
  • this cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
2 itxw5     
adj.构造的,组织的,建筑(用)的
参考例句:
  • the storm caused no structural damage.风暴没有造成建筑结构方面的破坏。
  • the north american continent is made up of three great structural entities.北美大陆是由三个构造单元组成的。
3 briz8     
n.镁
参考例句:
  • magnesium is the nutrient element in plant growth.镁是植物生长的营养要素。
  • the water contains high amounts of magnesium.这水含有大量的镁。
4 aonzx     
a.密集的,稠密的,浓密的;密度大的
参考例句:
  • the general ambushed his troops in the dense woods. 将军把部队埋伏在浓密的树林里。
  • the path was completely covered by the dense foliage. 小路被树叶厚厚地盖了一层。
5 lusyc     
n.制陶业,陶器,陶瓷工艺
参考例句:
  • the order for ceramic tiles has been booked in.瓷砖的订单已登记下来了。
  • some ceramic works of art are shown in this exhibition.这次展览会上展出了一些陶瓷艺术品。
6 dykwj     
n.硅(旧名矽)
参考例句:
  • this company pioneered the use of silicon chip.这家公司开创了使用硅片的方法。
  • a chip is a piece of silicon about the size of a postage stamp.芯片就是一枚邮票大小的硅片。
7 5ppzpr     
n.打火机,点火器;驳船;v.用驳船运送;light的比较级
参考例句:
  • the portrait was touched up so as to make it lighter.这张画经过润色,色调明朗了一些。
  • the lighter works off the car battery.引燃器利用汽车蓄电池打火。
8 2rgzdc     
n.食物的一份&adj.帮助人的,辅助的
参考例句:
  • the poor children regularly pony up for a second helping of my hamburger. 那些可怜的孩子们总是要求我把我的汉堡包再给他们一份。
  • by doing this, they may at times be helping to restore competition. 这样一来, 他在某些时候,有助于竞争的加强。
9 ulxzl     
vi.使分散;使消失;vt.分散;驱散
参考例句:
  • the cattle were swinging their tails to disperse the flies.那些牛甩动着尾巴驱赶苍蝇。
  • the children disperse for the holidays.孩子们放假了。
10 pvuwz     
vt.(使)稳定,使稳固,使稳定平衡;vi.稳定
参考例句:
  • they are eager to stabilize currencies.他们急于稳定货币。
  • his blood pressure tended to stabilize.他的血压趋向稳定。
11 zrqzo     
n.研究者,调查者,审查者
参考例句:
  • he was a special investigator for the fbi.他是联邦调查局的特别调查员。
  • the investigator was able to deduce the crime and find the criminal.调查者能够推出犯罪过程并锁定罪犯。
12 cbaz1     
n.灌输
参考例句:
  • old families need an infusion of new blood from time to time.古老的家族需要不时地注入新鲜血液。
  • careful observation of the infusion site is necessary.必须仔细观察输液部位。
13 rodzz     
n.密集,密度,浓度
参考例句:
  • the population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
  • the region has a very high population density.该地区的人口密度很高。
14 9xhzp     
n.(aluminium)铝
参考例句:
  • the aluminum sheets cannot be too much thicker than 0.04 inches.铝板厚度不能超过0.04英寸。
  • during the launch phase,it would ride in a protective aluminum shell.在发射阶段,它盛在一只保护的铝壳里。
15 orxx5     
n.经久性,耐用性
参考例句:
  • nylons have the virtue of durability.尼龙丝袜有耐穿的优点。
16 xxfzh     
n.树丛,草丛;vi.用沉重的脚步行走
参考例句:
  • a stream meandered gently through a clump of trees.一条小溪从树丛中蜿蜒穿过。
  • it was as if he had hacked with his thick boots at a clump of bluebells.仿佛他用自己的厚靴子无情地践踏了一丛野风信子。
17 dispersing     
adj. 分散的 动词disperse的现在分词形式
参考例句:
  • whereas gasoline fumes linger close to the ground before dispersing. 而汽油烟气却靠近地面迟迟不散。
  • earthworms may be instrumental in dispersing fungi or bacteria. 蚯蚓可能是散布真菌及细菌的工具。
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