Precipitation and dissolution of Mn-rich dispersoids during the heating of AA3xxx alloys

A. Dons; Y. Li; C. Marioara; Ch. Simensen; A. Johansen; A. Hakonsen; L. Arnberg; St. Benum

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Precipitation and dissolution of Mn-rich dispersoids during the heating of AA3xxx alloys

机译：AA3xxx合金加热过程中富锰弥散体的沉淀和溶解

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As cast AA3xxx alloys are strongly supersaturated in Mn and Fe at room temperature. When the alloy is heated to the homogenisation temperature at the usual rates of 50 to 250 K/hour, Mn-rich dispersoids will first precipitate, then partly dissolve. The nucleation rate depends on the composition of the alloy. The rate is fairly independent of the rate of heating, within the usual industrial range, giving a higher number of nuclei in slowly heated material. Even so, redissolution leads to a final number of dispersoids that is fairly independent of the rate of heating, but a function of the local solid solubility of Mn and Fe at the homogenisation temperature and on the available amount of Si.

机译：铸造的AA3xxx合金在室温下在Mn和Fe中强烈过饱和。当以通常的50至250 K /小时的速度将合金加热到均质温度时，富锰的分散质会先沉淀，然后部分溶解。成核速率取决于合金的组成。在通常的工业范围内，该速率完全与加热速率无关，从而在缓慢加热的材料中产生更多的核。即便如此，再溶解仍会导致最终的弥散体数量与加热速率完全无关，但最终数量取决于Mn和Fe在均质温度下的局部固溶度以及可用的Si量。

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《Aluminium》 |2004年第6期|p.583-587|共5页
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A. Dons; Y. Li; C. Marioara; Ch. Simensen; A. Johansen; A. Hakonsen; L. Arnberg; St. Benum;
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Precipitation and dissolution of Mn-rich dispersoids during the heating of AA3xxx alloys

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