高溫短時間時效處理對Mg-3Nd-1Zn合金微觀組織及力學(xué)性能的影響

高溫短時間時效處理對Mg-3Nd-1Zn合金微觀組織及力學(xué)性能的影響Effects of high temperatureshort time ageing treatmenton the microstructures and mechanical properties of Mg-Nd-Zn alloy

將固溶處理后的 Mg-2.7Nd-0.6Zn-0.5Zr 合金在 200~300℃之間進(jìn)行不同溫度及時間的高溫時效處理，研究高溫短時間時效處理對合金的微觀組織和力學(xué)性能的影響，并利用OM、SEM 及TEM對合金的微觀組織進(jìn)行表征。結(jié)果表明：固溶態(tài)Mg-2.7Nd-0.6Zn-0.5Zr合金經(jīng)250~275℃高溫短時間時效后，其室溫屈服強度和抗拉強度最高增加了近70%和29%，宏觀組織呈直線性不均勻分布的析出相。析出相的顯微形貌為顆粒狀，成分為Mg12Nd。析出相的線性分布方向平行于Mg基體(0001)Mg基面，合金的時效硬化行為與這種沿基面呈平行線分布的顆粒狀析出相密切相關(guān)。在250~275℃范圍內(nèi)時效20~30min 后屈服強度較高，這是由于在變形過程中顆粒狀Mg12Nd 的特殊分布對基面滑移及晶粒間協(xié)調(diào)變形起到很強的抑制作用。

Among the traditional cast Mg alloys system, Mg–3Nd–Zn alloy with high strength and heat resistance, has been widely applied in aeronautics such as in engine box and wing rib of airplane. In present research the as-cast Mg-2.7Nd-0.6Zn-0.5Zr (NZ31) alloy was solution treated and then aged at temperature ranging from 200 to 300℃. The microstructure and mechanical properties of the aged specimens especially at relatively high temperature (225~300℃) were systematically characterized by OM, SEM, and TEM. A new kind of precipitates distributed in line was clearly found in the specimens aged at high temperature (225~275℃) for a short time (15~30min), which corresponded to a significant enhancement of hardness and tensile strength at room temperature.The TEM results showed that the precipitates distributed in line had a composition of Mg12Nd and a granular shape, and mainly formed along the (0001)Mg basal plane.The special distribution of the granular Mg12Nd precipitates was effective barriers to the basal slips and may probably restrain the intergranular coordination during tensile deformation, leading to a large strengthening effect, that is, the yield strength and ultimate tensile strength, of the NZ31 alloy aged at 250~275℃ for 20~30min, increased by about 70% and 29% respectively, in comparison with only the solutionized one.

全文下載：https://pan.baidu.com/s/1eSpjNKQ

作為值得信賴的合作伙伴和高品質(zhì)金屬合金的半成品供應(yīng)商，通項公司擁有完善的服務(wù)體系和專業(yè)的團隊。在同客戶交易的過程中，我們力求根據(jù)不同的應(yīng)用需求將我們的產(chǎn)品做到精益求精。針對當(dāng)前和未來的市場需求，通項公司致力于為客戶提供最佳的金屬材料解決方案。

TXCO  has  been  a  reliable  partner  and  supplier  of  sophisticated  and  high-quality  semi-finished  products  maed  of  alloys.  In dialogue  with  our  customers,  we  optimise  our  products  to  meet  the  specific  application  requirements.  TXCO  develops  the  best  alloy  material  solutions  for  current  and  future  challenges.

獲取更多我們供應(yīng)的產(chǎn)品和服務(wù)信息，請致電086-021-6786 0205或發(fā)電子郵件service@sinoav.com聯(lián)系我們，您也可以通過微信，微博，領(lǐng)英，臉書，推特和谷歌+與我們互動。

For  more  information  on  the  products  and  services  that  we  supply,  call  us  at  086-021-6786 0205  or  email  us  at   service@sinoav.com.  You  can  also  get  in  touch  on  social  media,  we  are  constantly  active  on  Weixin,  Weibo,  LinkedIn,  Facebook,  Twitter  and  Google+.