综述了新一代铝合金晶粒细化剂Al Ti C的理论研究情况。Al Ti C晶粒细化剂克服了Al Ti B的缺陷 ,其异质形核核心TiC比TiB2 的聚集倾向更小 ,并对Zr、Cr、V、Mn等元素“中毒”免疫。在相同添加量时 ,Al Ti C细化效果优于Al Ti B ,已成为...综述了新一代铝合金晶粒细化剂Al Ti C的理论研究情况。Al Ti C晶粒细化剂克服了Al Ti B的缺陷 ,其异质形核核心TiC比TiB2 的聚集倾向更小 ,并对Zr、Cr、V、Mn等元素“中毒”免疫。在相同添加量时 ,Al Ti C细化效果优于Al Ti B ,已成为取代Al Ti展开更多
The influence of Si on the stability of TiC in Al melts was studied.It is found that TiC particles in Al melts become unstable with the addition of Si.When the melting temperature is below 890 °C,TiC will react w...The influence of Si on the stability of TiC in Al melts was studied.It is found that TiC particles in Al melts become unstable with the addition of Si.When the melting temperature is below 890 °C,TiC will react with Al and Si to form TiAlxSiy and Al4C3 phases.But if the melt temperature is above 890 ℃,TiC will react with Al and Si to form to Ti3SiC2 and Al4C3.It is considered that the influence of Si on the stability of TiC in Al melts is due to its incursion into TiC crystal lattice during the holding,which will cause serious lattice distortion in TiC and then speed up the out-diffusion of surrounded C atoms.展开更多
The modification effect of a new type of Al-P master alloy on Al-24Si alloys was investigated. It is found that excellent modification effect can be obtained by the addition of this new type of Al-P master alloy into ...The modification effect of a new type of Al-P master alloy on Al-24Si alloys was investigated. It is found that excellent modification effect can be obtained by the addition of this new type of Al-P master alloy into Al-24Si melt and the average primary Si grain size is decreased below 47 μm from original 225 μm. It is also found that the TiC particles in the melt coming from Al8Ti2C can improve the modification effect of the Al-P master alloy. When the content of TiC particles in the Al-24Si melt is 0.03%, the improvement reaches the maximum and keeps steady with increasing content of TiC particles. Modification effect occurs at 50 min after the addition of the Al-P master alloy and TiC particles, and keeps stable with prolonging holding time.展开更多
基金Project(50625101) supported by the National Natural Science Fund for Distinguished Young Scholars,China Project(51071097) supported by the National Natural Science Foundation of ChinaProject(11QG67) supported by the Fundamental Research Funds for the Central Universities,China
文摘The influence of Si on the stability of TiC in Al melts was studied.It is found that TiC particles in Al melts become unstable with the addition of Si.When the melting temperature is below 890 °C,TiC will react with Al and Si to form TiAlxSiy and Al4C3 phases.But if the melt temperature is above 890 ℃,TiC will react with Al and Si to form to Ti3SiC2 and Al4C3.It is considered that the influence of Si on the stability of TiC in Al melts is due to its incursion into TiC crystal lattice during the holding,which will cause serious lattice distortion in TiC and then speed up the out-diffusion of surrounded C atoms.
文摘The modification effect of a new type of Al-P master alloy on Al-24Si alloys was investigated. It is found that excellent modification effect can be obtained by the addition of this new type of Al-P master alloy into Al-24Si melt and the average primary Si grain size is decreased below 47 μm from original 225 μm. It is also found that the TiC particles in the melt coming from Al8Ti2C can improve the modification effect of the Al-P master alloy. When the content of TiC particles in the Al-24Si melt is 0.03%, the improvement reaches the maximum and keeps steady with increasing content of TiC particles. Modification effect occurs at 50 min after the addition of the Al-P master alloy and TiC particles, and keeps stable with prolonging holding time.
