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燃燒合成TiAl合金結(jié)構(gòu)轉(zhuǎn)變動力學(xué)的端部淬火熄滅法分析
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TG146.2

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EndQuenching and Extinguishing Analysis of Microstructural Evolution Kinetics in the TiAl Alloy Synthesized by Combustion
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    摘要:

    采用端部淬火熄滅法分析了蔓延工燃燒合成了Ｔｉ－５０ａｔ％Ａｌ合金中的組織結(jié)構(gòu)轉(zhuǎn)變動力學(xué)過程，發(fā)現(xiàn)合成反應(yīng)從鋁粉熔化處開始，合成反應(yīng)表現(xiàn)為Ｔｉ＋Ａｌ→１／３ＴｉＡｌ３＋２／３Ｔｉ→ＴｉｘＡｌ＋（１－ｘ）Ｔｉ→ＴｉＡｌ等一系列過渡反應(yīng)過程，這些反應(yīng)的前期是可依賴液態(tài)反應(yīng)物流動鋪展進(jìn)行質(zhì)量傳遞的快速液－固型反應(yīng)，可使試樣溫度迅速升高，為后續(xù)固－固型反應(yīng)奠定良好擴展條件，由于擴散質(zhì)量傳遞速度明顯代于液相流

    Abstract:

    The kinetics of microstructural transformation has been analyzed using an endquenching and extinguishing method for a Ti50at%Al alloy synthesized by combustion. It is shown that from start of aluminum powder melting, a series of transition reactions takes place one after another as follows: Ti+Al1/3TiAl3+2/3TiTixAl+(1-x)TiTiAl. The liquidsolid reaction at the early stage may heat the sample quickly, which can create a good condition for later solidsolid reactions. Since masstransfer during solidstate diffusion is much slower than that within liquid reactants, the later solidsolid reactions slow and some Ti core is left in the alloy for rapid cooling. The aluminum contents of the boundary layers of the Ti cores are higher than those of central parts of the Ti cores, and the boundary layers transform into annular 2Ti3Al phase during cooling.

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王學(xué)成 張小明.燃燒合成TiAl合金結(jié)構(gòu)轉(zhuǎn)變動力學(xué)的端部淬火熄滅法分析[J].稀有金屬材料與工程,1999,(3):161~165.[Wang Xuecheng, Zhang Xiaoming, Cai Huifen, Wang Xiaotian. EndQuenching and Extinguishing Analysis of Microstructural Evolution Kinetics in the TiAl Alloy Synthesized by Combustion[J]. Rare Metal Materials and Engineering,1999,(3):161~165.]
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