Microstructural feature and evolution of nano-twin bulk Cu specimens produced by means of dynamic plastic deformation at liquid nitrogen temperature (LNT-DPD) have been studied using tem.

利用透射电子显微镜，对液氮温度下动态塑性形变法(LNT - DPD)制备的块体纳米孪晶铜在不同形变量下的微观结构演变进行了研究。

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The results show that the plastic deformation is obviously different from that of bulk metal and the thickness plays a key role on the ductile to brittle transition in al interlayer.

结果表明：中间纯铝层的塑性变形行为明显不同于块体纯金属，其厚度尺寸对材料的韧脆转变具有显著影响。

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Recently, the need for acceptance sampling of bulk materials has increased especially for industrial products, such as powder chemicals or plastic beads.

近年来，对粉状化工原材料及塑料颗粒等工业产品的验收检验的要求日益增加。

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If you use plastic for the bulk of your spending, it's easy to assume that credit cards with cash-back features are a dream come true.

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But the plastic housing adds quite a bit of bulk to what is already relatively thick device.

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