最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

+高級檢索
Al-5Mg-2Si-Mn鋁合金壓鑄坯錠SIMA法半固態(tài)等溫組織演變
作者:
作者單位:

1.西北工業(yè)大學(xué);2.西北工業(yè)大學(xué)材料學(xué)院;3.西安北方光電科技防務(wù)有限公司

作者簡介:

通訊作者:

中圖分類號:

基金項目:

國家自然科學(xué)基金項目（面上項目，重點項目，重大項目）,國家重點基礎(chǔ)研究發(fā)展計劃（973計劃）


Semi-Solid Isothermal Heat Treatment Microstructure Evolution of Die-casting Al-5Mg-2Si-Mn Alloy by the SIMA process
Author:
Affiliation:

Northwestern Polytechnical University

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan) ,The National Basic Research Program of China (973 Program)

  • 摘要
    • |
  • 圖/表
    • |
  • 訪問統(tǒng)計
    • |
  • 參考文獻
    • |
  • 相似文獻
    • |
  • 引證文獻
    • |
  • 資源附件
    • |
  • 文章評論
    摘要:

    研究了不同壓鑄條件下Al-5Mg-2Si-Mn鋁合金壓鑄坯錠的等溫半固態(tài)組織演變過程。與重力鑄造相比，鑄態(tài)壓鑄實驗合金的α-Al初始晶粒尺寸細??；且壓射壓力越大，晶粒尺寸越小，組織中的畸變能越多。研究表明，重力鑄造與壓鑄實驗合金的半固態(tài)等溫組織演變過程相似，但壓鑄合金的演變進程更快。不同壓射壓力壓鑄實驗合金坯錠的半固態(tài)等溫?zé)崽幚磉^程中，α-Al晶粒直徑與等溫時間之間符合關(guān)系式 r ?^3=Kt+〖r ?_0〗^3，粗化速率常數(shù) K 隨壓射壓力的增大而減小。對于相同壓射壓力的壓鑄合金坯錠，隨等溫溫度的升高，半固態(tài)組織的α-Al的晶粒尺寸增大，粗化速率常數(shù) K 減小。在相同等溫時間條件下，壓鑄合金比重力鑄造合金等溫半固態(tài)組織的固相體積分數(shù)小，晶粒的粗化速率低。研究確定了實驗合金的優(yōu)化半固態(tài)等溫處理工藝為620 ℃等溫20 min。

    Abstract:

    Semi-solid isothermal heat treatment microstructural evolution of die casting Al-5Mg-2Si-Mn alloy with different injecting pressure was studied. The average α-Al grain size of as-cast die casting experimental alloys was smaller than that of gravity casting, and it decreased while microstructure distortion energy increased with the increase of the injecting pressure. It was found that semi-solid microstructural evolution process of die-casting alloy was similar with, but faster than that of gravity casting. The results from regression analysis show that the relationship between the average α-Al grain diameter and the isothermal holding time fits the formula r ?^3=Kt+〖r ?_0〗^3, and the coarsening rate (K) is decreased with the increase of the injecting pressure. For the fixed injecting pressure, the average α-Al grain size of the experimental alloy increased while the K reduced with the increase of the isothermal holding temperature. For the fixed isothermal holding time, the solid fraction and α-Al grain coarsening rate of die-casting alloy were lower than those of gravity. The appropriate semi-solid isothermal heat treatment parameters of the die casting experimental alloy were determined to be 620 ℃ for 20 min.

    參考文獻
    相似文獻
    引證文獻
引用本文

劉洋,楊光昱,張曉丹,程會民,介萬奇. Al-5Mg-2Si-Mn鋁合金壓鑄坯錠SIMA法半固態(tài)等溫組織演變[J].稀有金屬材料與工程,2019,48(9):2972~2980.[Liuyang, Yang Guangyu, Zhang Xiaodan, Cheng Huimin, Jie Wanqi. Semi-Solid Isothermal Heat Treatment Microstructure Evolution of Die-casting Al-5Mg-2Si-Mn Alloy by the SIMA process[J]. Rare Metal Materials and Engineering,2019,48(9):2972~2980.]
DOI：10.12442/j. issn.1002-185X.20180498

復(fù)制
文章指標
  • 點擊次數(shù):
  • 下載次數(shù):
  • HTML閱讀次數(shù):
  • 引用次數(shù):
歷史
  • 收稿日期:2018-05-15
  • 最后修改日期:2018-06-12
  • 錄用日期:2018-07-27
  • 在線發(fā)布日期: 2019-10-09
  • 出版日期: