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1·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。

2·Plenty of twin relationships are determined in the 20%mn steel and there exists the dependence of the formation of martensite induced by deformation on grain orientations of austenite.

确定了含锰20%的高锰钢中大量的孪晶关系和形变时诱导出的马氏体有明显的取向选择性。

3·During the deformation, differential stress inferred by use of calcite twin lamellae is more than 500 bar, and mechanics of stepped thrust faults is.

在变形过程中，断层活动的差异应力值，根据方解石双晶发育程度推导，得出在500巴以上。

4·At the time of deformation reached 40%, the appearance of the crystal changed greatly: the size refined, boundary turned clear, second phase disappeared and twin crystal structure appeared.

变形量为40%时，轧板的晶粒形貌发生了显著变化，晶粒变得细小，晶界清晰，第二相完全消失，并出现孪晶组织。

5·When the tensile load is not perpendicular to the twin boundary, the yield stress decreases and the deformation is mainly detwinning.

拉伸载荷与孪晶界不垂直时，屈服应力降低，变形方式则以去孪晶为主。

6·Extrusion of HDPE pellets in flight elements combination is studied by visualized co rotating twin screw extruder. Results show that pellets have little deformation in flight elements combination.

借助于装有玻璃视窗的可视化啮合同向双螺杆挤出机，对高密度聚乙烯(HDPE)颗粒在螺纹元件组合中的熔融过程进行了研究。

7·In this paper the formula of work of plastic deformation and the 3-dimensions figure of Twin shear stress yield criterion in the plane stress condition are derived.

文章导出了双剪应力屈服准则的塑性功串表达式及在平面应力条件下的三维图形；