鎂合金熱處理過程中組織與相的變化(已修改)
2025-06-30 02:44 本頁(yè)面
【正文】 鎂合金熱處理過程中組織與相的變化摘要：本文研究了AZ91D等溫?zé)崽幚磉^程中的溶質(zhì)擴(kuò)散、晶界熔化、晶粒合并以及相變等對(duì)枝晶球化過程的影響。結(jié)果表明:隨著熱處理時(shí)間的延長(zhǎng)，晶粒逐漸球化，而且發(fā)生合并現(xiàn)象；同時(shí)在界面能降低的驅(qū)使下，通過溶質(zhì)原子的擴(kuò)散,晶粒內(nèi)部包裹小液滴；半固態(tài)部分重熔過程中經(jīng)歷以下相變：β→α，α +β→L，α→L。關(guān)鍵詞：AZ91D鎂合金；等溫處理；相變The Research of Organization and Phase Change of Magnesium Alloy during Isothermal Heat TreatmentAbstract: The effect of solute diffusion and the grain boundary melting and grain merger and phase transitions on dendrite spheroidzing process is researched during the isothermal heat treatment. The results show that the grains gradually spheroidize and appear the merger phenomenon with extending the heat treatment the same time, owing to decreasing interfacial energy。 the packed small liquid drop form intra grain by the diffusion of solute atoms, There is the following phase transition: β→α,α+β→L,α→L during The semisolid remelting.Key words:AZ91D magnesium alloy。 isothermal treatment。 phase transition概述鎂合金是現(xiàn)代金屬結(jié)構(gòu)材料中最輕的一種，以其密度低、比強(qiáng)度和比剛度高、尺寸穩(wěn)定性好、電磁屏蔽好及價(jià)格穩(wěn)定等優(yōu)點(diǎn)，近年來在航空航天、儀器制造、國(guó)防和電子工業(yè)等領(lǐng)域，尤其是汽車工業(yè)中獲得日益廣泛的應(yīng)用[1]。鎂合金半固態(tài)成具有成形溫度低、凝固收縮小、缺陷和偏析減少、晶粒尺寸細(xì)小、
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