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固溶溫度對Mg-10Gd-3Y-1.2Zn-0.5Zr合金的組織演變規(guī)律和時效硬化行為的影響
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昆明理工大學 材料科學與工程學院

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國家教育部博士點基金;國家教育部回國人員科研啟動基金


Effects of solution temperature on microstructure evolution and aging hardness of Mg-10Gd-3Y-1.2Zn-0.5Zr alloy
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kunming university of science and technology

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    摘要:

    利用OM、XRD、SEM和TEM研究了Mg-10Gd-3Y-1.2Zn-0.5Zr（wt.%）鑄態(tài)合金的顯微組織和不同溫度下固溶熱處理后的組織演變規(guī)律。結果表明Zn含量為1.2%的合金在等溫固溶條件下，隨時間的延長，晶界處LPSO層狀生長，同時層狀相向晶內延伸，層狀相的層片變粗。隨溫度的升高鑄態(tài)組織中原有的層狀相溶解，而沿晶界化合物則向晶內有更寬的層狀相生成，并隨著溫度的提高而變寬。此合金經(jīng)不同溫度的固溶后達到時效硬度最高可達115HV。

    Abstract:

    The microstructures of Mg-10Gd-3Y-1.2Zn-0.5Zr alloys after solution heat treatment at different temperatures comparing with the as-cast conditions were studied by using the optical microscope, XRD, SEM and TEM. The results showed that the LPSO lamellar phase grew with time increasing under the conditions of isothermal solution. At same time, the lamellar phase extending into grain which induced the lamellar to become widen. The original cast lamellar phase dissolution with the temperature increasing, however, a wider lamellar phase produced along compound located at the grain boundary. The new lamellar phase width increased with time. The alloy after solution treatment at 525℃ the sample hardness could reach 115 HV.

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宋鵬.固溶溫度對Mg-10Gd-3Y-1.2Zn-0.5Zr合金的組織演變規(guī)律和時效硬化行為的影響[J].稀有金屬材料與工程,2016,45(2):431~435.[Song Peng. Effects of solution temperature on microstructure evolution and aging hardness of Mg-10Gd-3Y-1.2Zn-0.5Zr alloy[J]. Rare Metal Materials and Engineering,2016,45(2):431~435.]
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  • 收稿日期:2014-03-16
  • 最后修改日期:2014-04-08
  • 錄用日期:2014-04-15
  • 在線發(fā)布日期: 2016-07-15
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