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Mg-Gd-Y系合金中絕熱剪切帶的特征
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Characteristics of the Adiabatic Shear Bands in Mg-10Gd-2Y-0.5Zr Alloy
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    摘要:

    通過彈道沖擊試驗(yàn)和高溫Hopkinson Bar壓縮試驗(yàn)研究了Mg-Gd-Y系合金的絕熱剪切行為。利用光學(xué)顯微鏡對(duì)試驗(yàn)后試樣的組織進(jìn)行觀察。結(jié)果發(fā)現(xiàn)，該合金在兩種試驗(yàn)條件下形成兩種絕熱剪切帶。彈道沖擊過程中形成的剪切帶在光學(xué)顯微鏡下呈白亮色，平均寬度約為10μｍ，屬于白亮帶，帶內(nèi)組織的顯微硬度明顯高于周圍基體。白亮帶只能在穩(wěn)定塑性侵徹階段形成；整個(gè)高溫Hopkinson Bar壓縮過程中只在T=735 K時(shí)形成較明顯的塑性變形帶。遠(yuǎn)離絕熱剪切帶源點(diǎn)的裂紋的形成主要是由平行于剪切方向的孿晶引起的。

    Abstract:

    Dynamic compression tests and projectile impact tests were used to investigate the adiabatic shear behavior of Mg-10Gd-2Y- 0.5Zr alloy. The microstructural characterization of the post-test specimen was studied by means of optical microscopy. Two kinds of adiabatic shear bands were found in the post-test specimens impacted by spherical bullet and Hopkinson pressure Bar. The bands formed in the process of projectile impact are “white” bands of width about 10 μm. The microhardness in the “white” band is obviously higher than that in the matrix. In addition, the “white” bands come into being only in the stable penetrating stage because of enough strain. Obvious deformation bands can form only at T=735 K in the process of Hopkinson compression. The cracks within a propagating shear band are induced by twins paralleling to the shear direction.

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紀(jì) 偉,范亞夫,陳 捷,喬光利. Mg-Gd-Y系合金中絕熱剪切帶的特征[J].稀有金屬材料與工程,2009,38(4):599~602.[Ji Wei, Fan Yafu, Chen Jie, Qiao Guangli. Characteristics of the Adiabatic Shear Bands in Mg-10Gd-2Y-0.5Zr Alloy[J]. Rare Metal Materials and Engineering,2009,38(4):599~602.]
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  • 收稿日期:2008-03-24
  • 最后修改日期:2008-05-17
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