熱處理對(duì)流變壓鑄鋁合金力學(xué)性能和顯微組織的影響

熱處理對(duì)流變壓鑄鋁合金力學(xué)性能和顯微組織的影響Effect of heat treatment on mechanical properties and microstructure of rheo-diecasting aluminum alloy

采用旋轉(zhuǎn)永磁體攪拌工藝制備半固態(tài)A356鋁合金漿料并進(jìn)行流變壓鑄，研究熱處理工藝對(duì)流變壓鑄樣件本體力學(xué)性能的影響，并采用掃描電鏡(SEM)和能譜分析儀(EDS)進(jìn)行顯微組織分析。結(jié)果表明：采用T51熱處理時(shí)，當(dāng)人工時(shí)效時(shí)間為3 h時(shí)，σb=290 MPa、δ=8.5%，此時(shí)δ達(dá)到最大值；延長(zhǎng)人工時(shí)效時(shí)間，σb緩慢提高，但是δ下降；采用T6熱處理時(shí)，當(dāng)人工時(shí)效時(shí)間為1 h，σb=310 MPa、δ=16.5%；當(dāng)人工時(shí)效時(shí)間4.5 h時(shí)，σb=335 MPa、δ=10.5%，此時(shí)σb達(dá)到最大值，δ達(dá)到最小值。T6熱處理后，當(dāng)人工時(shí)效時(shí)間為1 h，試樣斷口具有大量的撕裂棱和韌窩，在晶界處產(chǎn)生大量富Si的鵝卵石形狀的強(qiáng)化相，當(dāng)量直徑小于4 μm。同時(shí)，在α(Al)基體內(nèi)形成大量富Si和富Mg的GP區(qū)和亞穩(wěn)相，還產(chǎn)生大量直徑小于1 μm的Al、Si和Mg的氧化物，并釘扎在α(Al)基體內(nèi)，與GP區(qū)和亞穩(wěn)相共同對(duì)α(Al)基體起強(qiáng)化作用。

Semisolid A356 aluminum alloy slurry was prepared and rheo-diecasted by rotating permanent magnet stirring process. The effect of heat treatment process on the mechanical properties of rheo-diecasting samples was studied, and microstructure of the samples was analyzed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that when T51 heat treatment is used, after being artificially aged for 3 h, σb is 290 MPa, δ is 8.5%, at this time, δ value reaches the maximum. When artificial aging time is prolonged, σb value increases slowly, whereas δ value decreases. When T6 heat treatment is used, after being artificially aged for 1 h, σb=310 MPa, δ=16.5%. After being artificial aged for 4.5 h, σb=335 MPa, δ=10.5%, at this time, σb value reaches the maximum, whereas δ value reaches the minimum. After T6 heat treatment, and being artificially aged for 1 h, a large number of torn edges and dimples are produced on the sample fracture surface, and a large number of pebble-shape strengthening phases with rich Si are produced at the grain boundaries, whose equivalent diameter is within 4 μm. At the same time, substantial GP zones with rich Si and rich Mg and metastable phases form in α(Al) matrix, and a large number of Al, Si and Mg oxides with diameter less than 1 μm are produced and pinned in α(Al) matrix. These oxides play an important role in strengthening the α(Al) matrix with the GP zones and metastable phases.

全文下載：https://pan.baidu.com/s/1RuHjgZOt3tR3Cxt1Bz5McA?

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(xiàng)公司擁有完善的服務(wù)體系和專業(yè)的團(tuán)隊(duì)。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(duì)當(dāng)前和未來的市場(chǎng)需求，通項(xiàng)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(qǐng)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(dòng)。

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+.