Interfacial microstructure and deformation mechanism of Ti-steel clad plate under high strain rate
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摘要: 在高應變速率下,鈦-鋼復合板不同材料以不同的變形機制協調變形,結合界面起到至關重要的作用.本文分析研究了高應變速率下鈦-鋼復合板的界面組織特征和變形機制.結果表明:在鋼側,隨著應變速率的提高,小角度(3°~10°)晶界含量增多,織構組分{112}〈241〉逐漸演變為織構{665}〈386〉和{111}〈110〉.在鈦側,隨著應變速率的提高,出現了明顯的形變孿晶組織,三種形變孿晶如{1121}〈1100〉拉伸孿晶、{1122}〈1123〉壓縮孿晶和{1012}〈1011〉拉伸孿晶產生的難易程度不一樣,變形機制由常規的"孿生變形為主"轉變為"位錯滑移與孿生變形共存"的復合變形模式.在結合界面處,隨著應變速率的提高,需要適應由兩側產生的不同變形抗力,才能夠實現連續變形而不致使材料發生破壞,其主要的協調機制依靠結合界面及附近晶粒的滑移實現變形.Abstract: Under high-strain-rate conditions, Ti and steel in Ti-steel clad plate deformed, with the deformation compatibility mechanism playing a key role at the bonding interface. The interfacial microstructure and deformation mechanism of Ti-steel clad plate under high strain were investigated in this paper. The results show that, for the steel side, with increasing strain rate, the number of small-angle (3°-10°) grain boundaries increases and texture component {112} 〈241〉gradually evolves into textures {665} 〈386〉 and {111} 〈110〉. For the Ti side, with increasing strain rate, deformation twins appear. Different deformation twins such as tensile twin {1121} 〈1100〉, compression twin {1122} 〈1123〉, and tensile twin {1012} 〈1011〉are produced. The deformation mechanism of the Ti side at high strain rate transforms from a conventional"twin deformation"mode to the compound deformation mode"coexistence of dislocation slip and twin deformation. "With the increase of strain rate, the bonding interface would coordinate the different deformation resistances of both sides, to achieve a continuous deformation without any materials damage. The main coordination mechanism relies on the bonding interface and the slip of adjacent grains.
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Key words:
- Ti-steel clad /
- high strain rate /
- microstructure /
- crystal orientation /
- deformation mechanism
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參考文獻
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