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
真空壓鑄Mg-7Al(-2Sn)合金組織性能研究及第一性原理計算
DOI:
作者:
作者單位:

作者簡介:

通訊作者:

中圖分類號:

基金項目:

遼寧省博士啟動基金（20131083）；遼寧省高校創(chuàng)新團隊支持計劃（LT2013004）


Microstructure, Mechanical Properties and First Principle Calculation of Mg-7Al (-2Sn) Alloys Prepared by Vacuum Die-casting
Author:
Affiliation:

Fund Project:

  • 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:

    利用光學顯微鏡、掃描電子顯微鏡、能譜分析、X射線衍射、差熱分析及拉伸試驗比較分析了2% Sn（質量分數(shù)）對真空壓鑄和固溶態(tài)Mg-7Al合金的組織與力學性能的影響。結果表明，向Mg-7Al合金中添加2% Sn元素后，能夠細化晶粒，抑制Mg17Al12相的生長，在組織中形成新相Mg2Sn，其以顆粒狀彌散分布于基體中；固溶處理后Mg-7Al合金中第二相數(shù)目明顯減少，AT72合金基體中仍存在細小顆粒狀Mg2Sn。由于合金組織細化、第二相數(shù)量的增加，Mg17Al12相形貌改善以及具有良好熱力學性質的Mg2Sn相的析出的綜合作用，使得AT72合金表現(xiàn)出比Mg-7Al合金更好的室溫及高溫拉伸力學性能；固溶處理后的AT72合金表現(xiàn)出更為優(yōu)異的力學性能，主要強化機制包括：固溶強化和彌散強化。此外，利用第一性原理計算從微觀理論角度探討了Sn合金化Mg-7Al合金力學性能改善的原因。

    Abstract:

    The effects of 2 wt% Sn on the microstructures and the mechanical properties of the die-cast Mg-7Al alloy and the solution-treated alloy were studied by optical microscope (OM), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and tensile tests. The results show that after 2 wt% Sn is added into the Mg-7Al alloys, the grains are refined, the growth of Mg17Al12 phase is suppressed and a few dispersed Mg2Sn particles with granular morphology are formed. After solution treatment the second phases of Mg-7Al alloys drastically decrease while fine granular Mg2Sn phases are still on the AT72 alloy matrix. AT72 alloy exhibits better tensile properties at both room and elevated temperature than Mg-7Al alloys due to the refinement of grains, increase of second phases, optimum morphology of Mg17Al12 and precipitation of Mg2Sn with better thermodynamic properties. The mechanical properties are improved after solid-solution treatment, which is attributed to solid-solution strengthening and dispersion strengthening. In addition, from the view of microscopic theory, the effect of Sn on the improvement of the mechanical properties of Mg-7Al alloy at elevated temperatures was discussed by first-principle calculation.

    參考文獻
    相似文獻
    引證文獻
引用本文

王 峰,孫士杰,毛萍莉,劉 正,安帥杰.真空壓鑄Mg-7Al(-2Sn)合金組織性能研究及第一性原理計算[J].稀有金屬材料與工程,2015,44(7):1668~1673.[Wang Feng, Sun Shijie, Mao Pingli, Liu Zheng, An Shuaijie. Microstructure, Mechanical Properties and First Principle Calculation of Mg-7Al (-2Sn) Alloys Prepared by Vacuum Die-casting[J]. Rare Metal Materials and Engineering,2015,44(7):1668~1673.]
DOI：[doi]

復制
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:2014-07-15
  • 最后修改日期:
  • 錄用日期:
  • 在線發(fā)布日期: 2016-01-04
  • 出版日期: