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晶界狀態(tài)對(duì)定向凝固Al—Cu和Renel25合金熱裂傾向的影響
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TG146.21 TG111.4

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Aeronautics and Astronautics Foundation of China(93G531 65)


Effect of Grain Boundary''''s State on the Hot Cracking Tendency of Directionally Solidified Al-Cu and Rene 125 Alloys
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    摘要:

    在ＨＲＳ定向凝固設(shè)備上進(jìn)行了合金熱裂試驗(yàn)，采用半定量方法評(píng)定了定向凝固Ａｌ－Ｃｕ和Ｒｅｎｅｌ２５合金熱裂傾向。觀察了合金的晶界，并分析討論了其對(duì)合金熱裂的影響。用晶界狀態(tài)分析的結(jié)果與試驗(yàn)結(jié)果完全一致。證明了晶界狀態(tài)對(duì)熱裂紋的形成有重要影響，其影響包括對(duì)晶間結(jié)合力的破壞作用和對(duì)晶界凝固收縮的補(bǔ)償作用。晶界狀態(tài)對(duì)熱裂影響的綜合作用取決于晶界低熔點(diǎn)相的分布和數(shù)量。

    Abstract:

    The experiments of the hot cracking tendency of the alloys were carried out in the HRS directionally solidified device. Hot cracking tendency of directionally solidified Al Cu and Rene 125 alloys was evaluated with a semi quantitative method. Grain boundaries were observed. Its effect on hot cracking is analyzed and discussed. The analysis result with grain boundary's state is in accordance with experiment result. It is proved that grain boundary's state has important influence on the formation of hot cracks. The effects include weakening the binding energy between grains and compensating solidification shrinking in grain boundaries. The comprehensive influence of grain boundary state on hot cracking tendency of an alloy depends on the distribution and amount of the phases with low melting points in grain boundaries.

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丁浩 傅恒志.晶界狀態(tài)對(duì)定向凝固Al—Cu和Renel25合金熱裂傾向的影響[J].稀有金屬材料與工程,2000,(4):228~230.[Ding Hao Fu Hengzhi . Effect of Grain Boundary''''s State on the Hot Cracking Tendency of Directionally Solidified Al-Cu and Rene 125 Alloys[J]. Rare Metal Materials and Engineering,2000,(4):228~230.]
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