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不同工藝制備的TiAl金屬間化合物微觀組織特征
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Microstructural Characters of TiAl Intermetallics Prepared with Different Processes
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    摘要:

    使用機械球磨制備細(xì)晶Ti/Al復(fù)合粉，采用不同的壓制工藝，通過反應(yīng)燒結(jié)和等溫鍛造方法獲得不同晶粒尺寸的TiAl金屬間化合物。對TiAl金屬間化合物的微觀組織特征進(jìn)行了分析，研究了不同制備工藝對其微觀組織的影響。 結(jié)果表明：采用冷等靜壓630 ℃反應(yīng)燒結(jié)及等溫鍛造工藝可以獲得晶粒尺寸5~8 μm的細(xì)晶TiAl金屬間化合物；通過普通冷壓、1250 ℃反應(yīng)燒結(jié)與等溫鍛造后，也能獲得近全致密的層片狀TiAl金屬間化合物，但晶粒尺寸為20~30 μm。

    Abstract:

    Fine-grain Ti/Al composite powder was prepared by mechanical alloying. TiAl intermetallics with various grain sizes were prepared by different compacting methods and reaction sintering as well as isothermal forging. The microstructural characters of TiAl alloys were analyzed. The effects of different processes on microstructures of TiAl intermetallics were studied. The results indicate that the processing of cold isostatic pressing, reaction sintering at 630 oC and isothermal forging can effectively reduce the grain size of Ti/Al alloys, and the grain size of the TiAl intermetallics is between 5 and 8 μm. The lamellar TiAl intermetallics, which are nearly fully dense, can also be obtained by common cold pressing, reaction sintering at 1250 oC and isothermal forging, but the grain size is 20~30 μm.

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喻吉良,李中奎,鄭 欣,韓文波.不同工藝制備的TiAl金屬間化合物微觀組織特征[J].稀有金屬材料與工程,2012,41(11):2054~2057.[Yu Jiliang, Li Zhongkui, Zheng Xin, Han Wenbo. Microstructural Characters of TiAl Intermetallics Prepared with Different Processes[J]. Rare Metal Materials and Engineering,2012,41(11):2054~2057.]
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  • 收稿日期:2011-11-23
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