Effect of pores on the cleavage of twinned boron carbide crystals
Effect of pores on the cleavage of twinned boron carbide crystals
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孔隙对孪生碳化硼晶体解理的影响
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
T. Ostapchuk
中科院分区：
文献类型：
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作者：
G. S. Oleinik;T. Ostapchuk
本文研究了两种多晶B_4C试样的亚结构和解理断裂。结果表明，在2000°C以下热压的试样中，无气孔晶粒中的孪晶是解理裂纹的有效阻挡层。解理断裂发生在{10
$$1 $$
1}。在2200°C以下烧结的试样晶粒中存在孪晶和小面状气孔。在这些晶粒中，解理是沿着孪晶面。孔隙消除了孪晶作为裂纹止裂物的作用。
AbstractThe substructure and cleavage fracture in two types of polycrystalline B4C specimens are investigated. It is shown that in specimens hot-pressed below 2000°C twins in poreless grains are effective barriers for cleavage cracks. Cleavage fracture occurs in planes of the type {10
$$ar 1$$
1}. There are twins and faceted pores in grains of specimens sintered below 2200°C. In these grains cleavage is along the twinning planes. Pores eliminate the effect of twins as crack stoppers.