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sayhalo

木虫 (小有名气)

[交流] pure Al 拉伸断口图 -龙卷风一样的窝窝 已有5人参与

大家看看,为什么我的 pure Al 拉伸断口图(球磨3h-烧结挤压),然后做拉伸试验,看到很多像龙卷风一样的窝窝,没有见过这么大的韧窝,这算是韧窝吗?
谢谢

见图


[ Last edited by xucz on 2011-5-2 at 23:29 ]
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gulin98

铁杆木虫 (著名写手)

不停的蜗牛


小木虫(金币+0.5):给个红包,谢谢回帖
pure Al 拉伸断口图(球磨3h-烧结挤压)?
用粉末冶金方法做的试样,会不会是烧结时,致密度不够的原因呢?
努力成为一个优秀的材料学家!
2楼2011-05-02 16:46:19
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sayhalo

木虫 (小有名气)

引用回帖:
Originally posted by gulin98 at 2011-05-02 16:46:19:
pure Al 拉伸断口图(球磨3h-烧结挤压)?
用粉末冶金方法做的试样,会不会是烧结时,致密度不够的原因呢?

我做过密度测试和微观检查,非常致密。
3楼2011-05-03 08:31:15
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liangzi0321

金虫 (正式写手)


小木虫(金币+0.5):给个红包,谢谢回帖
这是韧窝,而且韧性还不错
4楼2011-05-03 09:53:44
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neukdq

铁虫 (小有名气)


小木虫(金币+0.5):给个红包,谢谢回帖
韧窝越大越深,材料的韧性就越好!
平平淡淡才是真
5楼2011-05-03 10:34:32
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anin

木虫 (著名写手)

如来的神掌

延伸率多少?
问君能有几多愁,恰似一群太监上青楼~
6楼2011-05-03 11:10:19
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sayhalo

木虫 (小有名气)

引用回帖:
Originally posted by anin at 2011-05-03 11:10:19:
延伸率多少?

延伸率 28% 左右
7楼2011-05-03 17:41:56
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hui_jun_li

木虫 (正式写手)

★ ★ ★
小木虫(金币+0.5):给个红包,谢谢回帖
imrsfb(金币+2, MM-EPI+1): 谢谢专家的详细解答! 2011-05-04 08:50:52
Large dimple is called "dominant void", part of "microvoid Coalescence or Dimple Fracture" - usually occurs under single load or tearing. This is shown by depressions in the microstructure called dimples, which occur from microvoid emergence in places of high local plastic deformation. Under increased strain micrvoids grow, coalescence, until rupture occurs, thus dimple rupture. Dimple size and shape depends on the type of loading and extent of microvoid emergence. When a material is put under uniaxial tensile loading, equiaxed dimples appear which have complete rims. Under a tear loading the dimples are elongated, the rims of the dimples are not complete and the dimples are in the same direction as the loading. Shear loading has the same features as tear loading except the dimples are in opposite directions. The following sentences provide other common terminology associated with dimple fracture. Oval dimples occur when a large void intersects a smaller subsurface void, the dimples form an oval shape and exhibit complete rims. A serpentine glide is an interwoven pattern of glide plane decohesion steps. Ripples are partially smoothed out areas of serpentine glide. A stretched area is a flat, featureless area resulting from further straining of a ripple pattern. Intergranular dimple rupture occurs along grain boundaries due to nucleation and coalescence of voids at grain boundaries.
8楼2011-05-03 18:46:40
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sayhalo

木虫 (小有名气)

引用回帖:
Originally posted by hui_jun_li at 2011-05-03 18:46:40:
Large dimple is called "dominant void", part of "microvoid Coalescence or Dimple Fracture" - usually occurs under single load or tearing. This is shown by depressions in the mic ...

专家回答, 谢谢谢谢
9楼2011-05-03 19:37:37
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