脆性材料(brittle material)相对延展性材料(ductile material)区别就是塑性变形能力,从应力应边曲线上看,由于塑性变形,这条曲线和X轴包围的面积即应变能比脆性材料大很多,即使脆性材料的刚度要...
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尽管受到尊敬,但古人很快就认识到黄金的实用性,尤其是它的延展性,这使它成为制作珠宝的理想材料。
Despite their reverence, the ancients were quick to recognize gold's practical qualities, particularly its malleability, which made it ideal for jewelry.
而一旦把延展性引入进来,材料就变得脆弱了。
当晶体大小大约为3纳米(1纳米等于10亿分之一米)时,天然丝材料具有超强的强度与延展性特征。
When the crystal size is about three nanometers (billionths of a meter), the material has its ultra-strong and ductile characteristics.
So you don't have ductility, which is what you have in metal.
所以材料不具备延展性,而且金属中有自由电子。
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